I was informed by a mechanic today that he installed LSD, Dinan, on an E90 2008/9 M3 and that LSD modification alone increased horsepower by 50, hence, approximately 464 horses after installation. He did not specify whether it was 3.45 or 3.62 which add 9.5% and 14.9% respectively. Irregardless, even though that's not a word, an increase of 50 horsepower from LSD mod sounds a bit exaggerated. Can someone respond with with an explanation, their experience with LSD mod, or a technical explanation/clarification? I'm not a track guy and have basic technical knowledge (I think). I would like to upgrade my LSD and my exhaust. Does that sound like reasonable for a guy that will not track his M3 buy wants a little better horse and torque improvement on the street. And last, if I upgrade the LSD do I need to change anything else regarding compatibility for the vehicle to handle the additional torque or horsepower?