When you think of a sport-focused luxury sedan, two names stand out in 2025: the Mercedes-Benz C43 AMG and the BMW M340i. However, if you’re considering an Audi A5 vs BMW 4 Series Coupe comparison, these German-engineered machines redefine performance and elegance. The C43 AMG boasts a turbocharged V6 engine delivering an estimated 380-400 horsepower, propelling it from 0 to 60 mph in just 4.0-4.5 seconds. Meanwhile, the M340i, equipped with a 3.0L TwinPower Turbo Inline-6 engine, matches its rival with 382 horsepower and a 4.4-second sprint to 60 mph. Both models outshine competitors like the Audi S4, which offers 349 horsepower and a slower 0-60 mph time of 4.7 seconds. Whether you crave raw power or balanced refinement, these sedans promise an exhilarating driving experience, making the Audi A5 vs BMW 4 Series Coupe comparison an exciting topic for enthusiasts.
Key Takeaways
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The Mercedes-Benz C43 AMG has a turbo engine with 402 horsepower. It speeds up from 0 to 60 mph in 4.0 seconds.
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The BMW M340i has a smooth inline-6 engine with 382 horsepower. It goes from 0 to 60 mph in 4.4 seconds.
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Both cars handle well. The C43 AMG focuses on sportiness and grip. The M340i is more about agility and comfort.
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The M340i has a bigger trunk and more backseat space. It’s better if you need extra room.
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Think about your driving style. Pick the C43 AMG for strong performance. Choose the M340i for luxury and flexibility.
Performance
Engine and Power
Mercedes-Benz C43 Turbocharged Engine
The 2025 Mercedes-Benz C43 features a cutting-edge turbocharged petrol engine that delivers impressive performance. Its 2.0-liter inline-4 engine, paired with an electric turbocharger, produces around 402 horsepower and 369 lb-ft of torque. This innovative setup ensures rapid throttle response and consistent power delivery across the rev range. The electric turbocharger eliminates lag, making the C43 feel lively whether you’re cruising or pushing it to its limits. If you enjoy the thrill of turbo engines, the C43 offers a unique blend of efficiency and excitement.
BMW M340i Power-to-Weight Ratio
The BMW 3 Series M340i takes a different approach with its 3.0-liter TwinPower Turbo inline-6 engine. It generates 382 horsepower and 369 lb-ft of torque, providing a balanced mix of power and refinement. The M340i’s excellent power-to-weight ratio enhances its agility, making it feel light and responsive on the road. This sedan excels in delivering smooth acceleration and a linear power curve, which is ideal for both spirited driving and daily commutes.
Acceleration and Speed
0-60 MPH Times
When it comes to acceleration, both sedans are neck and neck. The Mercedes-Benz C43 sprints from 0 to 60 mph in just 4.0 seconds, showcasing its aggressive performance capabilities. The BMW 3 Series M340i follows closely with a 0-60 mph time of 4.4 seconds. While the difference may seem minor, the C43’s quicker launch gives it an edge for those who prioritize speed.
Top Speed Comparison
The top speed of the Mercedes-Benz C43 is electronically limited to 155 mph, aligning with most performance sedans in its class. Similarly, the BMW M340i matches this figure, ensuring both cars deliver exhilarating high-speed stability. Whether you’re on the highway or a closed track, these sedans provide confidence-inspiring performance.
Drivetrain and Transmission
Mercedes-Benz C43 Drivetrain Layout
The Mercedes-Benz C43 comes equipped with the 4MATIC+ all-wheel-drive system, which enhances traction and stability in various conditions. This system intelligently distributes power between the front and rear wheels, ensuring optimal grip during spirited cornering or wet weather. The 9-speed automatic transmission shifts seamlessly, contributing to the car’s dynamic yet refined driving experience.
BMW M340i Adaptive M Suspension
The BMW 3 Series M340i features a rear-wheel-drive layout as standard, with xDrive all-wheel drive available for added versatility. Its Adaptive M Suspension adjusts in real-time to road conditions, providing a perfect balance between comfort and sportiness. The 8-speed automatic transmission delivers quick and precise shifts, making the M340i a joy to drive in any scenario.
Handling and Dynamics
Cornering and Stability
When it comes to cornering, the 2025 Mercedes-Benz C43 and BMW 3 Series M340i offer distinct experiences. The Mercedes-Benz C43 features the 4MATIC+ all-wheel-drive system, which provides exceptional grip during sharp turns. This system actively distributes power between the front and rear wheels, ensuring stability even at high speeds. You’ll notice how confidently the C43 handles tight corners, making it a great choice for spirited driving on winding roads.
On the other hand, the BMW 3 Series M340i emphasizes agility with its rear-wheel-drive layout. This setup delivers a more engaging experience for drivers who enjoy precise control. The optional xDrive all-wheel-drive system enhances traction, especially in slippery conditions. The M340i’s near-perfect weight distribution further improves its balance, allowing you to tackle corners with ease. Whether you prefer the planted feel of the C43 or the dynamic nature of the M340i, both sedans excel in delivering confidence-inspiring handling.
Ride Comfort vs. Sportiness
Balancing comfort and sportiness is a challenge, but both sedans manage to excel in their own ways. The Mercedes-Benz C43 leans slightly toward sportiness, with a suspension tuned for performance. You’ll feel the road more, but the ride remains composed, even on uneven surfaces. The adaptive dampers allow you to switch between comfort and sport modes, giving you flexibility based on your driving mood.
The BMW 3 Series M340i, however, offers a more versatile ride. Its Adaptive M Suspension adjusts in real-time, providing a smoother experience during daily commutes. When you switch to sport mode, the suspension stiffens, enhancing cornering precision. This dual personality makes the M340i a strong contender for those seeking both luxury and performance. If you value a slightly softer ride without sacrificing agility, the M340i might suit your needs better.
Design
Exterior Styling
Mercedes-Benz C43 AMG Design Highlights
The 2025 Mercedes-Benz C43 AMG exudes a bold and aggressive presence. Its sharp lines and aerodynamic profile enhance both aesthetics and performance. The Panamericana grille, a signature AMG feature, dominates the front fascia, giving the car a commanding look. LED headlights with intricate detailing add a modern touch, while the quad exhaust tips at the rear emphasize its sporty nature. You’ll also notice the optional 19-inch AMG wheels, which perfectly complement the car’s dynamic stance. The C43 AMG’s design speaks to those who value a blend of luxury and athleticism.
BMW M340i Sporty Aesthetic
The BMW M340i takes a more understated yet equally captivating approach. Its kidney grille, now slightly larger, maintains the brand’s iconic identity. Sleek LED headlights and a sculpted hood create a sense of motion even when the car is stationary. The rear features dual exhaust outlets and a subtle lip spoiler, adding to its sporty appeal. The M340i’s design feels cohesive and refined, appealing to drivers who prefer a balance of elegance and performance.
Interior Design and Comfort
Luxury Materials in the C43
Step inside the mercedes-benz c43, and you’re greeted by a cabin that prioritizes luxury. High-quality materials like Nappa leather and brushed aluminum dominate the interior. The seats offer excellent support and adjustability, ensuring comfort during long drives. Ambient lighting with 64 color options allows you to personalize the atmosphere. The overall design feels modern and driver-focused, making every journey enjoyable.
Sporty Cabin of the M340i
The BMW M340i’s interior leans toward sportiness without sacrificing comfort. The seats, upholstered in premium Vernasca leather, provide excellent bolstering for spirited driving. Aluminum trim and contrast stitching add a touch of sophistication. The cockpit layout is intuitive, with all controls within easy reach. You’ll appreciate the driver-centric design, which enhances the overall driving experience.
Technology and Infotainment
Mercedes-Benz C43 Tech Features
The C43 AMG comes equipped with the latest MBUX infotainment system. Its dual 12.3-inch screens serve as the digital instrument cluster and central display. Voice control and touchpad functionality make navigation seamless. Features like augmented reality navigation and a Burmester surround sound system elevate the tech experience. You’ll find the system both intuitive and feature-rich.
BMW M340i Infotainment System
The BMW M340i features the iDrive 8 system, displayed on a curved screen that combines the instrument cluster and infotainment display. Gesture controls and voice commands make interacting with the system effortless. The Harman Kardon sound system delivers exceptional audio quality. The M340i’s tech suite feels modern and user-friendly, catering to tech-savvy drivers.
Practicality
Space and Storage
Trunk and Rear Passenger Space
When choosing a sport sedan, you want a car that balances performance with practicality. The 2025 Mercedes-Benz C43 offers a well-designed trunk with 12.6 cubic feet of cargo space. This capacity is sufficient for weekend luggage or a few grocery bags. Rear passengers enjoy decent legroom, though taller individuals might find headroom slightly limited due to the sloping roofline.
The BMW 3 Series M340i provides a slightly larger trunk, measuring 17 cubic feet. This extra space makes it more versatile for carrying larger items. Rear seating in the M340i feels roomier, with better leg and headroom compared to the C43. If you frequently travel with passengers or need more storage, the M340i edges ahead in practicality.
Fuel Efficiency
Mercedes-Benz C43 MPG Ratings
The Mercedes-Benz C43 combines performance with efficiency, offering an estimated 23 MPG in the city and 31 MPG on the highway. Its mild-hybrid system enhances fuel economy during stop-and-go traffic, making it a smart choice for urban driving.
BMW M340i MPG Ratings
The BMW 3 Series M340i delivers similar efficiency, with ratings of 24 MPG in the city and 32 MPG on the highway. Its inline-6 engine, paired with a mild-hybrid system, optimizes fuel consumption without compromising power. For those prioritizing fuel savings, the M340i provides a slight advantage.
Daily Usability
Urban Driving Comfort
Navigating city streets feels effortless in both sedans. The Mercedes-Benz C43’s compact dimensions and responsive steering make tight turns and parking manageable. Its 4MATIC+ all-wheel-drive system ensures stability on slippery roads.
The BMW 3 Series M340i excels in urban settings with its smooth ride and precise handling. The Adaptive M Suspension absorbs road imperfections, offering a more comfortable experience during daily commutes. If you value a softer ride in the city, the M340i stands out.
Long-Distance Travel Suitability
For long drives, both sedans deliver comfort and performance. The Mercedes-Benz C43 features supportive seats and advanced driver-assistance systems, reducing fatigue on extended trips. Its cabin remains quiet, even at highway speeds.
The BMW 3 Series M340i offers similar benefits, with additional rear-seat comfort for passengers. Its larger trunk also accommodates more luggage, making it ideal for road trips. If you often travel with family or friends, the M340i provides a more practical solution.
Price and Features
Pricing and Trim Options
Mercedes-Benz C43 AMG Pricing
The 2025 Mercedes-Benz C43 AMG starts at an estimated $62,000. This price reflects its premium positioning within the sport sedan segment. Mercedes offers a single trim level with a variety of optional packages. These include the AMG Night Package, which adds blacked-out exterior elements, and the Driver Assistance Package, which enhances safety features. Customization options, such as upgraded wheels and exclusive paint colors, allow you to tailor the C43 to your preferences. However, these extras can quickly increase the final price.
BMW M340i Pricing
The BMW M340i has a starting price of approximately $57,000, making it more affordable than the C43 AMG. BMW provides two configurations: the standard rear-wheel-drive model and the xDrive all-wheel-drive variant, which costs around $2,000 more. Optional packages, like the Premium Package, add features such as a heated steering wheel and a head-up display. The Shadowline Package enhances the car’s sporty appearance with black exterior accents. While the base price is lower, adding options can bring the M340i closer to the C43’s price range.
Standard and Optional Features
Mercedes-Benz C43 Features
The C43 AMG comes well-equipped with standard features that emphasize luxury and performance. You get the MBUX infotainment system with dual 12.3-inch displays, a Burmester surround sound system, and AMG-specific drive modes. The standard 4MATIC+ all-wheel-drive system ensures excellent traction. Optional features include ventilated seats, a panoramic sunroof, and advanced driver-assistance systems. These options enhance comfort and safety but add to the cost.
BMW M340i Features
The BMW M340i offers a strong set of standard features, including the iDrive 8 infotainment system, a 14-speaker Harman Kardon sound system, and a digital instrument cluster. The standard Adaptive M Suspension provides a balance between comfort and sportiness. Optional features include gesture controls, a heated steering wheel, and a premium leather interior. The M340i’s feature set focuses on blending technology with driving enjoyment.
Value for Money
Cost vs. Performance
When comparing cost to performance, the BMW M340i offers a slight edge. Its lower starting price and similar power output make it a more budget-friendly option for enthusiasts. The C43 AMG, while more expensive, delivers a unique driving experience with its electric turbocharger and AMG-tuned dynamics. If you prioritize cutting-edge performance technology, the C43 justifies its higher price.
Resale Value and Long-Term Costs
Both sedans hold their value well, thanks to their strong brand reputations. Historically, BMW 3 Series models have shown slightly better resale value due to their broader appeal. Maintenance costs for the C43 AMG may be higher, given its AMG-specific components. The M340i, with its simpler engine design, could offer lower long-term ownership costs. If you plan to keep your car for several years, the M340i might be the more economical choice.
Safety
Safety Ratings and Awards
Crash Test Results
Both the Mercedes-Benz C43 AMG and BMW M340i have undergone rigorous crash testing to ensure passenger safety. The C43 AMG has earned top marks in frontal and side-impact crash tests, reflecting its robust construction and advanced safety systems. Similarly, the BMW M340i has achieved high ratings in crash tests, showcasing its ability to protect occupants during collisions. You can feel confident knowing that both sedans meet the highest safety standards in their class.
Safety Accolades
The Mercedes-Benz C43 AMG has received recognition for its innovative safety features, including awards from leading automotive safety organizations. Its Pre-Safe system, which prepares the car for an impending collision, has been particularly praised. The BMW M340i has also garnered accolades for its safety, with its Active Driving Assistant earning high marks for effectiveness. These awards highlight the commitment of both brands to passenger protection.
Driver Assistance Features
Mercedes-Benz C43 Safety Tech
The C43 AMG comes equipped with a suite of advanced driver-assistance features. Standard systems include adaptive cruise control, lane-keeping assist, and automatic emergency braking. The optional Driver Assistance Package adds features like active lane-change assist and evasive steering assist. These technologies work together to enhance your confidence behind the wheel, especially in challenging driving conditions.
BMW M340i Safety Tech
The BMW M340i offers a comprehensive set of safety technologies as well. Standard features include forward collision warning, blind-spot monitoring, and rear cross-traffic alert. The optional Driving Assistance Professional Package adds adaptive cruise control with stop-and-go functionality and traffic jam assist. These systems make the M340i a reliable companion for both city driving and long highway journeys.
Reliability and Warranty
Manufacturer Warranty Coverage
Mercedes-Benz provides a 4-year/50,000-mile warranty for the C43 AMG, covering both the vehicle and its powertrain. BMW matches this with a similar 4-year/50,000-mile warranty for the M340i. Both brands also include complimentary maintenance for the first three years, ensuring peace of mind during the initial ownership period.
Predicted Reliability Scores
The C43 AMG benefits from Mercedes-Benz’s reputation for engineering excellence, with predicted reliability scores reflecting its robust build quality. The BMW M340i also scores well in reliability, thanks to its proven drivetrain and durable components. If you prioritize long-term dependability, both sedans offer strong reliability records, making them excellent choices for years of worry-free driving.
Driving Experience
Thrill Factor
Mercedes-Benz C43 AMG Driving Feel
The Mercedes-Benz C43 AMG delivers an exhilarating driving experience. Its 2.0-liter inline-4 engine, paired with an electric turbocharger, provides instant throttle response. You’ll feel the power surge as the car accelerates from 0 to 60 mph in just 4.0 seconds. The 4MATIC+ all-wheel-drive system ensures excellent grip, even during aggressive cornering. This setup makes the C43 AMG feel planted and confident, whether you’re navigating tight turns or cruising at high speeds. The steering is precise, giving you a strong connection to the road.
BMW M340i Driving Feel
The BMW M340i offers a more balanced approach to performance. Its 3.0-liter TwinPower Turbo inline-6 engine delivers smooth and linear power, reaching 60 mph in 4.4 seconds. The rear-wheel-drive layout provides a dynamic and engaging feel, especially for those who enjoy spirited driving. If you opt for the xDrive all-wheel-drive system, you’ll notice improved traction in challenging conditions. The Adaptive M Suspension enhances the car’s agility, making it a joy to drive on winding roads. You’ll appreciate how the M340i combines excitement with everyday usability.
Comfort vs. Sportiness
Balancing Performance and Comfort
The Mercedes-Benz C43 AMG leans toward sportiness. Its suspension is tuned for performance, allowing you to feel the road beneath you. While this enhances the thrill, it may feel firm on rough surfaces. The adaptive dampers let you switch to a more comfortable setting when needed. On the other hand, the BMW M340i strikes a better balance. Its Adaptive M Suspension adjusts in real-time, offering a smoother ride during daily commutes. When you switch to sport mode, the suspension stiffens, delivering sharper handling.
Which Car Feels More Engaging?
If you prioritize raw performance, the C43 AMG feels more engaging. Its aggressive acceleration and precise steering make every drive exciting. However, the M340i offers a more versatile experience. Its rear-wheel-drive dynamics and refined suspension create a connection between you and the car. For those who want a mix of comfort and sportiness, the M340i might be the better choice.
Sound and Emotion
Engine and Exhaust Notes
The Mercedes-Benz C43 AMG produces a deep and aggressive exhaust note, amplified by its AMG-tuned system. You’ll hear a satisfying growl when you press the accelerator. The BMW M340i, in contrast, offers a more refined sound. Its inline-6 engine emits a smooth and sporty tone, especially in sport mode. Both cars deliver an auditory experience that enhances the thrill of driving.
Emotional Connection to the Car
The C43 AMG appeals to those who crave excitement and exclusivity. Its bold design and performance-focused features create a sense of pride every time you get behind the wheel. The M340i, with its balanced nature, fosters a connection through its versatility and comfort. Whether you prefer the adrenaline rush of the C43 or the all-around appeal of the M340i, both cars offer an emotional bond that makes driving special.
Both the Mercedes C43 AMG and BMW M340i deliver exceptional performance, but they cater to different driving styles. The C43 AMG’s turbocharged inline-4 engine offers sharper throttle response and quicker acceleration, making it ideal for those who crave raw power. Its 4MATIC+ all-wheel-drive system enhances grip, especially during spirited cornering. The suspension leans toward sportiness, providing a thrilling yet firm ride.
The M340i, with its inline-6 engine, delivers smooth power and a balanced driving feel. Its rear-wheel-drive layout creates a dynamic experience, while the optional xDrive adds versatility. The Adaptive M Suspension adjusts for comfort or precision, making it perfect for daily commutes and long trips. If you prioritize practicality and refinement, the M340i fits your needs better.
Ultimately, your choice depends on whether you value aggressive performance (C43 AMG) or versatile luxury (M340i).
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