Quote:
Originally Posted by Pave Dew
On m235i there is only one catalytic converter and it's in the downpipe.
The whole exhaust from downpipe back is one piece and has no others cats but has a small resonator just ahead of rear axle and then the muffler at the rear.
I have MPE and sports cat DP and it sounds superb. You may want just eisenman rear box and a different DP.
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Okay, I understand better now. And from what I have read I would need a stage II tune if I am upgrading intake, charge pipe, FMIC, DP's and exhaust? Also, is the resonator needed? Not familiar with resonators on a car.