So, I'm going to be getting a biturbo to get better performance out of my qt50, but i just dont know for sure which to go with. I've been told (by trux) that i have to cut the header off my original muffler and have it welded to the biturbo, so does it even matter what biturbo i get? (ie, do i get the puch biturbo, or the tomos biturbo, etc) Are there differences in the expansion chambers, or are the differences only in the header configurations?
Also, I've been told by a welder that older mufflers cant be welded, because the steel gets impregnated with carbon. Anyone have any problems, or thoughts on that?