I have headman shorty's and y-pipe 2.5 in what should i put on it from here back to get a good sounding exhaust. Mild performance engine 300hp 350 ci..... probably not going to put on a cat....

 

any 3" catback will work fine for your application. it just depends on what kind of sound you want, but they all flow about the same. Hooker makes a really nice catback that i like. i also like the single outlet flowmaster force II system.