Join Date: Sep 2012
Motorcycle: 2009 GSX-R750 | 2012 S1000RR
Re: M4 gp slip on + Mjs mid pipe fitment issue
You're probably missing the gasket piece that was on the cat where the stock muffler slid onto the cat. Take a look at the cat and you should see a metallic type sleeve about 2" long on the end of it. Remove it, slide it on the MJS pipe. Done dollar.
Last edited by GlobeWarmer; 11-26-2012 at 02:09 AM.