The next items are, custom axis shocks, lonstar rear axle and A-Arms, IMS desert tank, IMS foot pegs, bumper, brake and shifter levers. I will post pictures as the quad comes together. This quad will also be on display at the Off-road expo in pamona October 4-5th.
The best 4 stroke exhaust system I've ever used or tested by far is from a company called Thunder Alley. It's a guy up in Sac. that hand makes them and hand tigs them out of Stainless. They're all 100% hand made. The tubing is even rolled and tigged by him. I know he has them for the CRF and YZFs, I think he was getting into the quads also. Last I saw they were cheaper then anyone else. I 100% recommend them!!!!
Sorry, I know this isn't YFZ related but just thought I'd give this guy a plug. I've met him at the track and he comes off as a good guy. When I bought one for my YZF he was at the track and went around to everyone there with a bike he had a system for and offered to bolt it on and let them demo it on the track. I did it and was blown away. I ordered one like a month later. It showed up about 3 weeks later and I hadn't even paid for it. He just shipped it with a note saying to send him a check when I had a chance or to return it if I wasn't happy for some reason. That's pretty cool to me!!!