yeah, kind of a falsehood tho . I used 3 1/2" short bullet, roundy round muflers, (not real quiet), then welded 3 1/2" spiral inserts about 1/2 way up in them. w/ a full 3 1/2" exhaust , turned down in front of the rear axle. Doesn`t leak, resonate or roar anywhere, no dirt roads so no stirring up dust, and of course is very free flowing. Also wrapped the entire thing, just because I had a bunch of used wrap. Probably hurts the low end a little w/ the loose convertor and fair sized roller cam , but who cares on a 505" engine ! Also running a mech. fan, I don`t worry too much about loosing 10 h.p. with aprox. 700 on tap. Did I SAY, I HATE HEADER WRAP ?!? -LOL