Quote:
Originally Posted by Seba77W
Yes there is only one cat on the stock F30/32 N55 exhaust. It sits in the down pipe. I went with the Fabspeed HFC down pipe and the power gains were immediately evident. And obviously no CEL and just passed emissions test last month. I also have the Active Autowerke axle back so my only stock part of the exhaust is from the resonator to the down pipe.
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are there dyno sheets that show gains of the high flow?