Oh look, he already has a GB running...
http://forums.bimmerforums.com/forum...light=flywheel The 318 isn't listen but the 325 uses the same tranny as the 318.
FWIW - I have a lightweight flywheel on my 318ti. I used an OEM alternative that is many pounds lighter (and MUCH cheaper). It's nice, but it chatters a bit. It revs faster and drops revs MUCH faster. Boost is dependent on revs...so you better be quick.
And...this is the one everyone wants:
http://www.uucmotorwerks.com/flywheel/LFWLE36SH.htm