Originally Posted by slemmer
Would you know if it will be a straight swap with an '06 330 diff with the ZHP option? Is there a gearing diff between the two?
If you check your gearing calculator I think it shifts your whole rpm band up about 250-500rpms...I can't remember; it did when I compared it to my 2.93.
Either way, if you do the conversion to the 3.62 M3 diff, I personally think it's a bit on the high side, considering your car does not rev as high as the e46 m3, you're definitely sacrificing some speed in each gear cause your car revs lower.
Not trying to knock this thread, but just from what I've researched when i was looking to do this swap.