The most common thing I have heard is that the cat back with the midpipe made by SLP doesn't sound good. But i know the cat back itself sounds good. I will be going full exhaust when it happens from headers back...so which headers and midpipe sound best with the SLP loudmouth cat back.
my setup is VERY LOUD... however i don't drive much, it only takes me 10-15 mins in traffic to get to work. I wouldn't want it that loud if I had any type of commute.
people on sites...i have heard the off road pipe and slp loudmouth catback....to me it sounds like a tractor....does not sound good at all...very loud, raspy and not clean sounding at all