Originally Posted by sg335
Two piece rotor with aluminum hat weighs less than one piece cast rotor. Four piston StopTech or Brembo ST40/F40 caliper weight less than stock caliper. Look up the respective weights of both on the web and you will see significant savings in weight by going with a similar sized BBK.
Yep, weights of stock vs. Brembo and Stoptech here (post #3): http://www.m3post.com/forums/showthread.php?t=150944