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Whatever you need, 3 inch will flow over 300kw so 2.5 inch would do most guys. Bigger is always better with turbo cars though if you can handle a little extra noise.

First and most important is to ditch the dump pipe.

As long as the o2 sensor is left in position the ecu won't complain, it may take a few days to learn the new fuel requirements though. (Unless you reset the long term fuel trims with Consult3.)

  • 3 weeks later...

If I get the dump pipe and front pipe done can u hook it up to the stock exhaust, until I get the aftermarket cat back system.

Yes, it will work fine.

You might need to slot the holes in the flange as the new front pipe will be 3" and the OEM pipe will be 2.5".

It isn't a big deal in the meantime though.

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