Imho, you just have to do some serious comparison shopping. Some things you want in a free flow exhaust is...
1.True dual, not axle back.
2. 2.5"dia. Piping. (Some like 3" but its loud raspy and if not designed right? Can reduce power?)
3. High quality materials. 304, 409 stainless is good. Top notch would be titanium and lower grade would be aluminum.
Just an opinion. Fast intentions, ark and aam all make excellent quality true duals. I think FI is 1,100 if I'm not mistaken? And the others around 1300-1400. But sales change that up a lot as well. If you go over 2,000 then it better be titanium. Anything else would be sub-standard.
