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I think its for both. I read a couple of threads about it but I don't have one myself. Out of the 8 people who installed, only 1 didn't like it, and the other said it was a must have. I am thinking of putting one myself, but I'm waiting till I think my 328i is not fast enough. As of this moment, I'm still satisfied with my baby. But yea, I've heard it really boosted up the 0-60 speed WITHOUT increasing hp or torque. I think you should go for it!
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