Originally Posted by jtvr4
Did you bother to read my post? You'd have to replace nearly everything on your 335i to compete with a stock M3. Congrats on wasting your money and thanks for proving my point.
Actually according to car and driver, VIR bone stock:
E90 M3: 3:05
Their conclusion: If the 335I had come with a limited slip diff, instead of an open diff, the times would have been equal. So as long as you are keeping both cars stock, all you would need in the 335I is an LSD.