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I don't have an M3 yet, but I have had the bmw perf exhaust on my 330i for like 6 years now. 3 years ago we bought a great old house in the city, most of the homes on our street don't have a driveway because it is such an old neighborhood (I do thankfully!).
The first 80 seconds or however long that stupid cold start high idle/air pump on thing lasts my car is pretty damn loud.
I have AWESOME neighbors, on both sides (the whole damn street is great really) and they have never complained, but on mornings that I have to leave really early, I will put the clutch in and let it roll down the driveway a bit before firing it up just to not be so annoying to them.
I wish Bemvo tuned N52s, because I would have that stupid 'feature' done away with.
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