SLP cat back...which headers and mid pipe?

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.
 
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