i got a catback from a guy on this site. there are no problems. just my misunderstanding of how the stuff works. but low tech answer is the V6 i have with the catback sounds pretty intimidating but not at all like my neighbors Borla on his V8 Tundra. I want the sound he's got but i'm afraid the extra cylinders makes all the difference.
i don't even get the cool glug, glug, glug sound i thought i'd get at idle. it's almost quiet, too quiet. well now that i put the Mickey Thompsons on that's all i got. i'm not even a threat at a red light anymore.