bent70
Husqvarna
AA Class
I plan on getting the open pipe map flashed soon and was looking at affordable ways to open up the exhaust. I went from the zipty fmf can to the idea of modding a clearanced FMF 4.1 exhaust off a kx450. I ended up just experimenting by drilling the rivots out of the stock can and seeing what I had to work with. Basicly, the inside of the can was fiberglass surrounding a perferated steel inner cylinder with a perferated plate blocking off the inside of the cylinder halfway down. I just drilled out the tacks and pounded the plate out allowing for an unrestricted flow though. I then rivoted the can back together and it is barely louder, only when you get on the throttle. Next is to get the remap to open pipe and hopefully get the gains I need out of this bike down low.