i have heard bubs and they are way to high pitched when the bike revs. never heard scepters but they are the loudest and honestly the low rumble of the tbike pipes is perfect. all depends how much sound you want

Frank

(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves NOW-2010 silver and black tbird