i have o/r x and pypes m80s i love it its loud but not to loud i had straight pipes before and it was toooooo loud i almost want a o/r prochamber with the pypes m80s would be the PERFECT set up

 

pro chamber is way to tame IMO, the o/r h is louder then the prochamber and i dont notice the difference in deepness between the 2, just sound volume.

o/r x-m-80's = pure sex.

it sounds better then old school stangs IMO old school dos not scream like bloody murder in high rpms like s197 does its just hollow and basically stays the same, sounds good in low rpms and normal driving conditions but just doesnt do it for me at WOT