Originally Posted by Jeff@topgearsolutions
Wastegate rattle is inevitable on this car, keeping that in mind, don't get downpipes if you dont want to hear it. Dp's give some decent power, but if you have a tune already you can actually gain more power with a good intercooler.
I think you mean more dyno or glory day power... certainly not in real life where it is currently 40 degrees almost everywhere and you arent tracking the car.
2009 135i 6AT
E40 PTF Protune, AR Dp's, 5" ETS FMIC, BMS DCI, M3 RSFB's, Koni Yellow Shocks, Michelin PSS