OK guys. I installed my new DRD on my 07 WR450 and it took about 15 minutes total. I spent another 15 minutes trying to line up the header so that it cleared the top bolt on the oil filter and it DOES NOT. Not matter how I fussed with it...when it's torques to spec it will not clear the bolt. Since mine is the complete system I was curious about weight vs. the stock system. The DRD weighs 6.54lbs. complete. The stock unit weighs 3lbs. more. The DRD is 3 inches shorter at the back of the bike vs. the stock system. My unit shipped without the quiet insert...it sounds awsome and I probably will not run the quiet insert when it arrives (I purchased it with the system...it just didn't ship with the system). I'll post up some pics tomorrow. -Jay Ha! See I'm not crazy!