Yes, MAYBE top end. You'll really have to drive fast and far to reach the limitations of a shorter rear end in terms of top speed. You do have to shift earlier in each gear. So, it ruined by 0-60 runs because my 2-3 shift happens around 52 MPH(?) or so. But, I never really time myself so it doesn't really matter. It does make corners and squirting in and out of traffic much easier, not to mention a lot more fun!

Gas mileage went down about 2 MPG. Not a huge difference in my book. But to each his own.

I can't remember what I spent for it. But, if you find a wrecked auto 330i, they carry that diff. A LSD would be even better, but more pricey.

Johnny