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M Performance Exhaust muffler power gains? Plus question on sound.
Are there any power gains to be expected from just changing out the stock M235i muffler to the M Performance version? Anyone every seen a dyno of one vs the other (maybe on other BMW cars?).
Also, with the "fake" engine/exhaust sound coming from the speakers in this car, does the sound (in the car, windows up) change at all with the M Performance exhaust or is it pretty isolated to the exterior and the inside sounds the same?
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