the car in question is a E36 M3 3.2 on my sig. currently im running the standard 3.23 diff and my car is still bone stock standard and running very well. im considering buying a 3.64 cwp set from an E46 m3. do i need to change pinion bearing when doing the swap to my car? is it a wise mod to start with on a daily car that even drives long distances at times. will it really hurt fuel consumption on the freeway in 6th gear because i believe i will be running same ratio as E46 m3 with "identical" box?
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