bodangly
11-19-2010, 11:13 AM
Ok so I have a 2004 325xi automatic, and I want to get a little more performance out of it. I heard swapping differentials can make a big difference in acceleration at the expense of top speed and gas mileage. The only thing is, with a 325xi automatic I already have a 3.46 differential. Would it be safe to swap in a 3.64, or even a 3.91? Would the difference be worth it? Would I be putting too much strain on the car?