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I would never have bothered with one, as I have always felt that if it was better than what's in the car they would have just used that from the factory. However, my buddy had an e46 M3 and I drove the car before and after. All I can say is wow what a difference. It makes the car feel like it went from a sports car to a race car.
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"The laws of physics cannot be repealed, even with DSC." - BMW Owner's Manual
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