I've got the stock pipes ('03 Speedmaster) that I sawed off with a band saw kind like Dinqua has on his site. But I left the fiberglass/mesh stuff around the inside of the pipe in there. For baffles I went to a local muffler shop and had them make me a 3" to 1.5" reducer that would just fit inside the muffler. I ended up squeezing the 1.5" end in a vise a little more to get a little more back pressure and quiet. Then I installed the reducers in the mufflers with the 1.5" end on the inside of the mufflers with a couple of sheet metal screws. I know this isn't real high-tech, but it works and I only spent about $10.00 total. It sounds good and I didn't have to re-jet at all.
