Quote:
Originally Posted by N & M
No that is nothing Nike what I am saying actually. The trend is manufacturers are selling genuine upgrades to customers with added advantage of retaining warranty and quality.
BMW calls it a performance exhaust so I expect it should add some performance.
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BMW tell us straight up that there are no performance gains with an exhaust and BTW the "line" is call BMW M Performance not the exhaust.
Q: Any power gains from the M Performance Exhaust?
A: Few gains should be expected just from changing axle back exhaust on a turbocharged BMW because 1) the main restrictions are in the two catalytic converters, which are retained with an axle-back exhaust and 2) no gains should be expected without remapping the ECU because the ECU is always correcting, so for example if the car loses backpressure, the ECU will reduce power.
http://f87.bimmerpost.com/forums/sho....php?t=1191101