o.k so you would cut open the exhaust just as keithw did and then you would cut that can like thing out at the begining of the exhaust, now this is when the dirt bike exhaust comes in. you could go on ebay and find a used performance muffler off a small 2-stroke dirt bike like a KX-65 fmf exhaust or some thing for cheap and cut it to were you just have the muffler its self an a little bit of the straight pipe left so you have welding surface. Now if you wanted to you could cut/what ever it takes to get the baffles out if you want even more flow.
So you would weld the dirt bike muffler in place of the can like thing or as keithw explains it whitch might be better "a glass pack kind of thing" and weld the new muffler in place, take out the number of baffles you want then weld it back together and you have a sleeper exhaust.
This is just a thought dont know how it mould work so i put it on here so i can get your guyes opinions.
