honestly speaking, it did slow down my car, but not by a long shot. I mean, my car still pulls hard, and i can still chirp my tires.... i think it hampers the cars acceleration a bit, otherwise, i dont really notice the difference. at least after i got use to it.
Those are the sizes I have on my 330i. I didn't notice very much difference in performance... maybe a couple 10th's of a second slower in acceleration to 60? The difference is so minor, very negligible. I say go for it! :thumbup:
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