I made this for TDR since people wanted to hear the magnaflow but thought I would post here as well... http://www.industrialoffroad.com/geeklog/public_html/filemgmt/visit.php?lid=13
Yup. I'm thinking of getting a piece of 4" exhaust tubing and sliding it inside the muffler at different positions. Basically to effectively shorten the muffler to make it louder or change the tone of the exhaust.
Why not ditch the muffler and see if you like it. I have mine straight piped and with the windows up you can hardly hear it. No loud drone pulling either.
I'll pull the valve cover and take the rocker arms off the 2nd set of valves... That will work right?