Custom Exhaust

[Wrighty525isport]

You may loose a little power down low, but at higher RPMs it may "feel" faster, at least mine did without exhaust. BUT.. it will be very loud, and very raspy. If I were you I would at least keep the resonator.

I agree, keep the resonator. By definition it has an effect on exhaust pulses and pressure waves so removing it may cause an imbalance. Exhaust science is more of a specialist subject than alot of people sometimes think. is the cat before or after the resonator? i'd probably get rid of it as it is just a flow restriction at the end of the day.

If after the exhaust change the car runs well, no flat spots or hesitation and your plugs look normal after a good few miles you haven't upset anything to the degree that the ecu can't adjust to compensate, then its smiles all round

[alexander525]

yeah thats what some guys at work where telling me when i brought the idea up. they figured i would just be throwing away low end and mid range power. and knowing BMW they made that stock ehaust the way it is for a reason