Just received a Powercore 4 off of Ebay and am having problems on the install. 1. The stock muffler clamp is too big. Where do I find one smaller? 2. It didn't come with the gasket between the muffler/header pipe. What should I use? 3. Is there supposed to be a metal sleeve inside of the rubber bushing on the rear mount? 4. The pipe comes really close to the rear brake reservoir. Should I relocate it, or is it OK Thanks for your help.