Dinan's LSD isn't for the auto because the gear ratios are different. The auto has a higher gear ratio due to the taller over drive. I have the Dinan LSD in mine (manual) and it's worth the investment. I got a good deal from Dinan on it by just talking with the sales guy. I already had PS2s, which helped out a lot. Hell, even non rft snow tires are better than the factory sport rft tires. After tires and LSD, get into the M3 suspension bits to keep things in line better....noticeable differences there as well!
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