I have D&D on my 00 Zr 600 LE. I like the sound of the pipe. Not to loud at low speed. Gas milage is about the same as my buddies stock 600. Mine came used with the D&D cluthing on it. The cluthing could be different. If you like a real hard pull off the line. You'll like it. But if you stop and go ALOT.. It can get annoying. It can be very smooth at mid range though. Buts the stop and go is hard on the belt. But other than that. No problems with mine. Sled has 3300 miles on it. I belive it has had it since I was new. Bought it from someone I know. Think SNOW!