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M3 / M4 · Power
M3 / M4 Downpipes Install Guide
Your M3 / M4
Pick your year to see what fits.
This page covers the US M3 / M4.
+20–40 whp (est.)
Expert$1,000–$1,5004 hrs
Why do it
Frees the turbos.
Tools you'll need
- Jack and 4 jack stands
- Socket set
- Torque wrench
- O2 sensor socket
- Penetrating oil
Starting out? See our budget tool list.
Parts to buy
- VRSF 3 inch catless downpipes Lists the 2015-2018 M3 and M4.Fits 2015–2018
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Before you start
- Check your local laws before removing a cat.
Steps
Unplug the sensors
- Unplug the connectors and clear the top.
Remove the old pipes
- Unbolt the downpipes and pull them.
Fit the new pipes
- Fit the new pipes and check the fit.
How to know it worked
- No exhaust leaks.
- No check engine light after your tune.
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Safety first
- Park on flat ground, set the parking brake and chock the wheels.
- Never get under a car held up only by a jack. Use jack stands.
- Let the engine and exhaust cool first.
- Disconnect the battery before unplugging electrical parts.
- Wear safety glasses.
- If something doesn't match your car, stop and ask a shop.
Follow your part's instructions and your service manual's torque specs.
Downpipe install guides for other cars