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Got a custom downpipe done by a small local company. The exhaust smell is noticeable, but only on the outside. Can't really smell it inside, unless the car is parked idle for a few minutes.
As for tune, yup - I'm on Bootmod2 Stage 2 AGG 93 OCT at the moment. You'll need to map the ECU after installing the downpipe to trick the car that cat is still there, which is a good excuse to get a tune map while you're at it.
It's all a bit of a hassle, but it's well worth it in my opinion - makes the car much more fun.
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