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Message: <blockquote data-quote="Juan Powerblow" data-source="post: 370057" data-attributes="member: 20">Thanks for your feed back. But, I find the solution pretty strange i.e. the part about maybe the engine doesn't produce enough low end torque to benefit from a freer flow exhaust. Maybe, I'm missing something on my physics 101. E46F, heeeeeelp! By right, the improved air flow which comes with bmw performance should permeate throughout the rev range via improved throttle response. The deficiency you pointed out may apply to forced induction but it shouldn't with an aftermarket exhaust with freer air flow.  Anyway, I guess I just have to take the plunge and try it for myself. BTW, can I ask what's the mileage on your car now? The reason is, if your car is very new i.e. below 10,000 kms, it's still a tight engine and prone to feeling a bit different every day. From my own experience with the E46 and E92 which I bought spanking new, consistent engine performance tends to come in only after 10,000 kms.</blockquote>