Originally Posted by joexr
I have an FMF Titanium4. I took perforated stianless steel , 1/4 " holes , 3/16 " apart and cut a 2" wide strip 20" long and twisted it a full turn. I put this thru the core and put a disc I cut of it over the end under the tip.
I tried this in my Two Bros on my SV650, but couldn't get twists straight enough to get down the muffler! I think this is probably a better option for power, though.