When I bought car (2008) it came with an mbrp catback installed. I've since added lethal h pipe, while I do like the sound it's just a bit too loud. I've been listening to sound clips and skimming the forums still undecided. But from what I gathered jba or 07-09 gt500 mufflers might be the answer. I don't have the OEM's and have never heard them or the jbas in person. Does anyone have experience with these w/o cats?