Ratio on M-Roadster Diff Yeah that is an issue. I may consider pulling my 3.45LSD from my e36 M3 track car and using that then upping my track car diff to a 3.64 or 3.75. Not sure If I can just swap the diff (and just swap covers) or if I need to swap internals. Quote: Originally Posted by cali-ti nice find! stock ratio (assuming you have a 5-speed manual) is 3.45 so you'll be even slower than stock! you'll have a theoretical higher top end (assuming the 4 can get it there) ... except for being electronically limited to something around 116-120mph. i'm also assuming that the M-roadster one is a LSD so you'll gain there as well if you have an open diff. | __________________ David '97 318ti, '97 318is, '96 Z3, '95 M3 (club racer) |