2 cents
Ive had the following:
(none had a x or h pipe):
Flowmasters on a 502/502: Didnt like what I called the "Tin can sound": Hard to describe, but the sound was something like it. Some others may claim the same. Ive got flows on my 440 now, same thing
Borla on a Ls1: Same thing as above
Dynomax on a plain jane 350: Same thing
Im trying to get the old school rumble without the canned type sound. Im still looking: I beleive glass packs, regardless of blowing out or how they may/may not be restrictive, may be the way to go, for me at least
It seems all the chambered type exhaust Ive used just has a "tinny" sound I cant get around