Don't bother they're all Chinese made, go to a local shop that's good.. And get a magna flow made up, it will be cheaper and last longer.. Also it will be US made for less than Chinese.. Cuz of all the shipping involved, a Chinese muffler is $100 in parts and $500 in shipping, then sold for $900...
Mine was $550 made by Road Race engineering.. You can look em up..
aww.. i have a 2.5" magnaflow fs..
Single port, will be a little cheaper, thats what i did.. and it's a custom deal, so it's about how well made it is.. Quality isn't always cheap..
I've gotten a couple offers for Cpe single, but not really what I'm looking for.
They really are so few and far between, hit or miss it seems.