Don't believe everything you read on the Internet(Shibumi @ Jul. 11 2007,14:56) Somebody ping GPW, he did this with Thor for about 30 lbs +/-. Search his threads, I think he posted the component weights and savings...
Drivetrain avoirdupois is most immediately noticeable in performance- 520 conversion w/aluminum sprockets, BST wheels, lightweight brake rotors (thinner, smaller diameter), Brembo monobloc calipers. Congratulations, you just spent SIX GRAND!!!
Ohhhh, but it is SWEEEEET......
P.S.- Oh yeah, Greg spent $15,000 altogether...