I installed my new Axle-Exchange aluminum drive shaft that weighs only 12lbs yesterday. I also took a video of how cool my car sounds with it in. My car sounds like it has a supercharger now as the faster the drive shaft spins the more it sounds like a supercharger whine.
See my review and video on my build thread.
http://www.ft86club.com/forums/showthread.php?t=24596