Hello fellas, I,m writing this post to hopefully help you unsatisfied Mach Z owners out. I own a 05 Mach Z that in my experience has totally lived up to it's King of the hill status. My dealer is Land N Sea Marine in Waterbury Ct. Bob and Phil Tiso are the owners and are good friends of mine. They have a lake race trail kit that is awesome! I think you fellas should give them a call and let them answer some questions you may have. Their number is 203-755-2682. ask for Bob Tiso. Another friend of mine has started his own snowmobile performance shop and is a real clutching expert. Mark Viccio of Watkins Glen NY is the man. His number is 607-535-4688. If you need motor work done, porting,rebuilding, whatever, you need to call A2Z racing in Mass. Dan Zering is the man. His number is 413-896-1486. Thats it, if your sled doesn't flat out rock when you contact one of these guys it's time to take up golf! Tell them The Goldenchild sent you. Good Luck.