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      11-09-2012, 02:00 AM   #5
HP Autosport

Drives: F80 M3
Join Date: Mar 2007
Location: Santa Barbara, AP, Brembo, GIAC, Koni, Ohlins, Performance Friction,

iTrader: (34)

Originally Posted by Autobahn335i View Post
It's about 3 lbs per corner. And definitely noticable in the handling of the car!

The 365mm rotors will of course weigh a little bit less vs the 380mm, but not much.

If your wheels clear the 380mm kit, I would get that one in the front (if you track the car regularly - otherwise it's $$$ overkill for a street car).

I have 355/345 mm on my track-prepped 335i and it works great.
Those weight saving numbers are about right. The 365mm rotor maybe a 1-2 lbs lighter. If you are looking for more weight saving, the Stoptech Trophy will save you nearly 5 lbs on their 380mm 6 piston kit and around 8 lbs per corner on their 355mm kit.