BMW G87 M2 performance exhaust system install tips for your garage

When you install a BMW G87 M2 performance exhaust system at home, focus on three essentials: use the right tools, follow safety procedures, and read the manufacturer instructions carefully. Always set up a clean, level workspace and lift the car securely. Mistakes often happen when you skip steps or rush the process. Expect to spend a few hours and use basic hand tools, but always wear gloves and eye protection.

Key Takeaways

Prepare your workspace and tools before starting to save time and avoid frustration.
Always prioritize safety by using jack stands, wearing gloves and eye protection, and disconnecting the battery.
Mark and cut exhaust pipes carefully using a new pipe cutter for clean, precise cuts.
Test fit all parts before final installation to ensure proper alignment and avoid leaks or rattles.
After installation, check for leaks, secure all bolts with a torque wrench, and consider an ECU tune for best performance.

Preparation

Tools & Equipment

Before you start, gather all the tools and equipment you need. Having everything ready will save you time and prevent frustration. Here is a checklist to help you prepare:

Metric socket set and ratchet
Combination wrenches (10mm, 13mm, 15mm)
Torque wrench
Impact driver or cordless drill
New pipe cutter (for clean, precise cuts)
Exhaust hanger removal tool
Flathead screwdriver
Jack and sturdy jack stands
Wheel chocks
Penetrating oil (for stubborn bolts)
Safety gloves and eye protection

Tip: Always use a new pipe cutter for the cleanest cuts on your factory pipes. Dull blades can cause jagged edges and make fitment difficult.

Workspace Setup

Set up your workspace before you lift a wrench. Choose a flat, level surface like a garage floor or driveway. Make sure you have enough room to move around the car and lay out your tools. Good lighting helps you see small parts and read instructions clearly.

Position your jack and jack stands under the manufacturer’s recommended lift points. Double-check that the car sits securely before you crawl underneath. Place wheel chocks behind the rear wheels to prevent rolling.

Note: Never rely on a hydraulic jack alone. Always use jack stands for safety.

Safety Tips

You must prioritize safety when working on your BMW G87 M2. Wear safety gloves to protect your hands from sharp edges and hot surfaces. Use eye protection to shield your eyes from debris and metal shavings.

Disconnect the negative battery terminal before you unplug any sensors or electronic components. This step prevents accidental short circuits. Let the exhaust cool completely before you start. Hot exhaust parts can cause serious burns.

Caution: The G87 M2 uses sensitive electronic sensors in the exhaust system. Handle all connectors gently and avoid pulling on wires.

Stock Exhaust Removal

Lifting the Car

Start by lifting your BMW G87 M2 safely. Position your jack under the manufacturer’s recommended lift points. Raise the car until you have enough clearance to work under the exhaust system. Place jack stands securely under the chassis. Double-check stability before you crawl underneath. Use wheel chocks behind the rear wheels for extra safety.

Tip: Always test the car’s stability by gently shaking it before you start working underneath.

Disconnecting Sensors

Locate the electronic sensors attached to your stock exhaust. These may include oxygen sensors or exhaust valve actuators. Carefully unplug each connector. Press the release tab and pull the connector straight out. Avoid pulling on the wires. Set the connectors aside where they will not get damaged.

Note: Disconnect the negative battery terminal before handling any sensors. This step prevents electrical shorts and protects sensitive electronics.

Removing Hardware

Use your socket set and wrenches to remove the bolts and clamps holding the exhaust in place. Start at the rear muffler section and work your way forward. Remove the exhaust hangers with a hanger removal tool. Support the exhaust as you loosen the last bolts to prevent it from dropping suddenly.

Remove all mounting bolts and nuts.
Slide the exhaust out of the rubber hangers.
Lower the stock exhaust carefully to the ground.

Caution: Some aftermarket systems require you to trim the factory muffler outlet pipes. Mark the cut points clearly before using your pipe cutter.

Handling Tight Bolts

You may encounter bolts that refuse to budge. Spray penetrating oil on stubborn hardware and let it soak for several minutes. Use an impact driver for extra leverage if needed. Apply steady pressure to avoid stripping the bolt heads.

Pro Tip: If a bolt still will not move, apply gentle heat with a heat gun to expand the metal and break the bond.

By following these steps, you can remove your stock exhaust system efficiently and prepare for the new performance upgrade.

Pipe Cutting & Fitment

Marking Cut Points

You must mark your cut points with precision before you start cutting. Most aftermarket exhaust systems for the BMW G87 M2 require you to trim the factory pipes. This step is especially important if you install an X-pipe or custom tips. Always refer to the manufacturer’s instructions for the exact measurement. Use a tape measure and a permanent marker to draw a clear, straight line around the pipe. Double-check your measurements before you make any cuts.

Tip: Mark both the top and bottom of the pipe. This ensures your cut stays straight all the way around.

Using a Pipe Cutter

A new pipe cutter gives you the cleanest and most accurate cut. Place the cutter on your marked line and tighten it until the blade touches the pipe. Rotate the cutter around the pipe, tightening it slightly after each full turn. This method prevents the pipe from crushing and keeps the edge smooth. Avoid using a hacksaw or old cutter, as these can leave jagged edges and make fitment difficult.

Recommended Steps:

Secure the pipe with a clamp or have a helper hold it steady.
Align the cutter blade with your marked line.
Rotate and tighten gradually until the pipe separates cleanly.

Note: Always wear gloves and eye protection during this step. Metal shavings can cause injury.

Test Fitting

After you cut the pipe, test fit the new exhaust components before final installation. Slide the new section onto the cut pipe and check for proper alignment. Make sure the fit is snug and the angles match the rest of the system. Adjust as needed to avoid leaks or rattles. If the fit is not perfect, use a file to smooth any rough edges.

Confirm that all hangers and brackets line up.
Check that the tips sit evenly in the rear valance.
Ensure there is enough clearance from heat shields and suspension parts.

Pro Tip: Take your time during test fitting. Small adjustments now will save you trouble later in the install.

BMW G87 M2 performance exhaust system Install

Aligning Components

Proper alignment ensures your BMW G87 M2 performance exhaust system delivers both performance and reliability. Begin by cleaning the exhaust pipes and surrounding area. This step removes debris and allows for a polished finish. Wear safety gloves and glasses to protect yourself from sharp edges and debris.

Line up each new exhaust component according to the manufacturer’s instructions. Slide the pipes and mufflers into place, making sure each section fits snugly. Take your time to check that the exhaust tips sit centered and symmetrical within the rear valance. Misalignment can cause rattling, leaks, or even damage to the undercarriage.

Tip: Always double-check the alignment before tightening any clamps or bolts. Small adjustments now prevent bigger issues later.

If your system includes carbon fiber tips, verify their fit before final installation. Gently slide them onto the exhaust outlets and ensure they sit flush and even. Use the provided clamps or fasteners to secure the tips tightly. A secure fit prevents leaks and unwanted movement.

Gaskets & Seals

Gaskets and seals play a critical role in preventing exhaust leaks. Inspect all connection points and replace any worn or damaged gaskets. Position each gasket precisely between the flanges as you assemble the BMW G87 M2 performance exhaust system.

Apply a thin layer of high-temperature silicone or exhaust sealant at each joint if recommended by the manufacturer. This extra step helps create a gas-tight seal and reduces the risk of leaks. Make sure the gaskets do not shift out of place as you bring the flanges together.

Note: Never reuse old gaskets. Always install new ones for the best seal and long-term reliability.

Securing Bolts

Once you have aligned the components and installed the gaskets, begin tightening the bolts. Use a torque wrench to tighten each bolt to the manufacturer’s specified torque value. This step prevents over-tightening, which can damage flanges, and under-tightening, which can cause leaks.

Follow this order for best results:

Hand-tighten all bolts and clamps to hold the system in place.
Check the alignment of the entire BMW G87 M2 performance exhaust system.
Use the torque wrench to tighten bolts in a crisscross pattern, ensuring even pressure.
Secure all clamps and brackets, including those for carbon fiber tips.

Pro Tip: After the first heat cycle, recheck all bolts and clamps. Thermal expansion can loosen hardware, so a quick retorque ensures everything stays secure.

Connecting Sensors

Modern exhaust systems rely on sensors for optimal performance. Carefully reconnect all oxygen sensors and exhaust valve actuators. Plug each connector in until you hear a click, confirming a secure connection. Avoid pulling or twisting the wires, as this can damage sensitive electronics.

If your BMW G87 M2 performance exhaust system includes provisions for additional sensors, follow the manufacturer’s wiring instructions closely. Route all wires away from hot surfaces and moving parts. Use zip ties or clips to secure the wiring harnesses.

Caution: Always reconnect the negative battery terminal only after all sensors are plugged in and secured.

Once you finish the installation, start the engine and listen for any abnormal sounds or vibrations. Inspect all joints and connections for leaks. If you notice any issues, shut off the engine and address them before driving.

Tuning & Sound Check

ECU Tune

You may need to tune your BMW G87 M2’s ECU after installing a performance exhaust system. Some aftermarket exhausts change the airflow and backpressure, which can affect how your engine runs. A professional ECU tune helps your car adapt to these changes. You get the best performance, smoother throttle response, and improved fuel efficiency.

Note: Not every exhaust system requires a tune. Always check the manufacturer’s recommendations before you start the engine.

If your system does require a tune, schedule an appointment with a reputable BMW tuner. Many shops offer custom ECU mapping for the G87 M2. You can also use a handheld tuner if you have experience with ECU programming. Follow all instructions carefully to avoid damaging your engine or voiding your warranty.

Benefits of a professional ECU tune:

Maximizes horsepower and torque gains
Ensures proper air-fuel ratios
Prevents check engine lights and error codes
Improves drivability and throttle response

Sound Testing

After you finish the installation, you should test the sound of your new exhaust system. Start your BMW G87 M2 in a well-ventilated area. Let the engine idle for a few minutes. Listen for any rattles, leaks, or unusual noises. Walk around the car and check the exhaust tips for even output.

Tip: Ask a friend to rev the engine while you listen from behind the car. This helps you catch any issues that only appear at higher RPMs.

Compare the sound to your expectations. Some systems offer adjustable valves or inserts to fine-tune the exhaust note. If you hear any hissing or popping, inspect all joints and clamps for leaks. Tighten connections as needed.

A proper sound check ensures your BMW G87 M2 sounds as aggressive or refined as you want. You also confirm that the installation is leak-free and safe for daily driving.

Final Checks

Inspection

Before you start your BMW G87 M2, perform a thorough inspection of your work. You want to ensure every connection is secure and every sensor is properly attached. Use this checklist to guide your final review:

Confirm all bolts and clamps are tight and torqued to spec.
Check that every gasket sits correctly between flanges.
Inspect exhaust hangers for proper placement and support.
Verify all sensors are plugged in and wires are routed away from heat.
Ensure exhaust tips are centered and clear of the bumper.

Tip: Use a flashlight to check hard-to-see areas. A careful inspection now prevents headaches later.

Leak Test

After you finish your visual inspection, you need to check for exhaust leaks. Start the engine and let it idle. Move around the exhaust system and listen for any hissing or popping sounds. Place your hand near (but not on) each joint to feel for escaping air. You can also use a soapy water solution—spray it on the joints and look for bubbles, which indicate a leak.

Listen for unusual noises at every connection.
Feel for air movement around clamps and flanges.
Watch for bubbles if you use soapy water.

Note: If you find a leak, shut off the engine and retighten the affected bolts or clamps. Replace gaskets if necessary.

Test Drive

Take your BMW G87 M2 for a short, careful test drive. Pay close attention to the sound and feel of the exhaust. Listen for rattles, vibrations, or any new noises. Monitor the dashboard for warning lights or error messages. After your drive, recheck all bolts and clamps. Heat cycles can loosen hardware, so a quick retorque ensures long-term reliability.

Drive at low speeds first, then gradually increase RPM.
Listen for changes in exhaust tone or performance.
Inspect the system again after the drive.

Pro Tip: Keep your tools handy during the test drive. You may need to make quick adjustments when you return.

Common Mistakes

Fitment Issues

You may encounter fitment issues during your BMW G87 M2 exhaust installation. Pipes might not align, or tips may sit unevenly in the rear valance. These problems often result from inaccurate pipe cuts or skipping the test-fit step. Always double-check your measurements before cutting and test-fit every component before final tightening. If you notice misalignment, loosen the clamps and adjust the pipes until everything lines up. Use a file to smooth rough edges that prevent a snug fit.

Tip: Watching a step-by-step video tutorial can help you visualize the correct alignment. The IND Distribution walkthrough for the Eisenmann G87 M2 Twin-Flow Exhaust System shows practical solutions for common fitment challenges.

Missing Hardware

Missing hardware can cause rattles, leaks, or even system failure. You might forget to install a clamp, bracket, or gasket, especially if you rush or work in a cluttered space. Lay out all hardware before you start and check off each piece as you install it. If you lose a bolt or nut, replace it with the correct grade and size—never substitute with random hardware.

Checklist for avoiding missing hardware:

Organize all bolts, clamps, and gaskets before starting.
Refer to the manufacturer’s parts list.
Double-check each connection during final inspection.

Note: Many video guides, such as the Milltek and MAD Exhaust installation videos, highlight the importance of using the right tools and hardware, including specialized pliers for hanger removal.

Sensor Errors

Sensor errors can trigger warning lights or affect engine performance. You might damage a sensor by pulling on wires or forget to reconnect a plug. Always disconnect the battery before handling sensors and plug them back in securely after installation. Route wires away from hot surfaces and moving parts.

If you see a check engine light after installation, review your work. Make sure every sensor is connected and undamaged. Video tutorials often provide close-up visuals of sensor locations and proper handling, making troubleshooting much easier.

Pro Tip: Some guides also show how to disable Active Sound Design, letting you enjoy the true sound of your new exhaust system.

Recommended video resources for troubleshooting:

Comprehensive BMW G87 M2 exhaust installation guides (Milltek, MAD Exhaust).
Step-by-step Milltek exhaust installation video.
Tool recommendations, such as Lisle Exhaust Hanger Removal Pliers.
Instructions for disabling Active Sound Design.
Detailed photos and notes for alignment and timing.

You now have the essential knowledge to install a BMW G87 M2 performance exhaust system in your garage. Careful preparation, attention to detail, and double-checking every step help you achieve a professional result. Share your experiences or questions in the comments to help others in the community. For your next project, consider exploring additional DIY upgrades or schedule a professional tune for optimal performance.

Your cart is currently empty.