I was planning on getting the ZZP catback next month but I've heard so much on this forum about catbacks not being beneficial until your over the 300whp range. I already have Pacesetters Coated with a Catless D/P, EGR delete, and a 2.5" midpipe instead of the resonator. Should I just buy the mufflers that come in their $450+ system and weld them into my factory piping?