Originally Posted by BMW_7
3.45, (same), its from a sport package 318is. I really didnt want to change the ratio so I jumped on this.
Now that I see the 3.91 for sale, I wonder how my car would drive with it. But My RPMs are like 4000 at 140 km/h, so I wouldnt want it to get worse...
how do u like ur new diff?