The only thing I can suggest is patience and persistance. I had the same problem, just last week, fitting my new Gnarly on my '02 KDX 200. I was laying on my back in my garage for over an hour, trying to get the pipe in the exhaust hole. I was thinking there's no possible way it'd go in, but I took a break, went back at it, and it went right in. I wish I could suggest a better approach for you, as I didn't do anything different from the first try to the second. I can tell you that I didn't hook the springs up until I got the pipe to fit properly in the hole, and I tried with the hooks and without. GOOD LUCK, don't give up... You'll have a different bike once you get the pipe fitted properly