Whats Deeper
#2
Concept G is very LOUD and deep. Buschur sounds good, I would say even mellow and deep although maybe the race version is loud. Havent heard the AMS personally so can't comment on that one.
#7
I seem to think the Buschur TBE is slightly louder than the AMS TBE (Both test pipes) Search around and you should find some reviews. Both are similar, Buschur is lighter and AMS has a little more bling so it's kind of a toss up.