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S3 Cat-back exhaust Install Guide
Your S3
Pick your year to see what fits.
This page covers the US S3.
+3–8 whp (est.)
Hard$2,090–$2,0902–3 hrs
Why do it
Valved sound and more flow.
Tools you'll need
- Jack and 4 jack stands
- Socket set
- Torque wrench
Starting out? See our budget tool list.
Parts to buy
- IE cat-back IEEXCI9 The same exhaust as our video.Fits 2015–2020
Doesn't fit your car (0)
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Steps
Remove the stock exhaust
- Free the grommet and take off the stock system.
Fit the new parts
- Fit the hardware to the new system.
Connect it
- Fit it to the downpipe and reconnect the valve motor.
How to know it worked
- No exhaust leaks at the joints.
- Tips sit even in the bumper.
- Nothing touches the body.
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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.
Cat-Back Exhaust install guides for other cars