hahaha i know man i use to have the long cherry bomb on my 74 comet and my dad wants to hot rod it all the time just hear it loud enough
maybe its the motor mounts?might be squished down with time or not the right one?i know my right side one was broken in 2 for the longest and i had no idea till i swapped the headers in it had been split in 2 and was doing all sorts of messin with the take offs.And yeah i love the sound of em,especially the low rumble when i get off of it and start slowing down