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Old 10-27-2012, 10:36 AM   #18
xi_ter
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Join Date: Nov 2006
Location: Edmonton, Canada
Posts: 2,221
My Ride: 2003 325xi
I have thought about doing this upgrade, but the 330i rotors are 20 lbs each - 5 extra lbs of unsprung weight.
Unsprung wt would jump from about 75 to 80 lbs and make the 325xi feel slower.
While the 325xi can use the 330i and xi calipers on front and rear, this upgrade increases unsprung weight a lot and hurts handling in the end.
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