steve bigelow was looking for btdt on cheapo muffler... on my 4ks with I5, i used a canadian tire thrush muffler ($25) for the resonator and tailpipe..i can weld my own pipes but that aside, the project went well and did not sound loud or raspy...it sounded powerful and mellow...too bad it was gutless. mike 86 5kcdtq, tap chip sjm spring 84 5ks 84 5ksw many cyclops bicycles