Guys, got a question for yaz...I was at the local R/C car hobby shop awhile back, and we got to talking about pipes. Guy I was talking to said there was another guy who blew up a few engines in rapid succession. They couldn't figure out why at first, but I was told they finally figured (he said) that the reason was because the pipe was rubbing the header, and the resulting black metallic crap was going back into the cyl. and doing damage(!) Do you think the (is it) reflected wave or pulse could push gunk into the cyl./ piston enuf to damage things? Car pipes are the same, only different, right like 1/4 wave, or whatever the tech. term is?