IMO, pacesetter is the worst in terms of quality, then pypes followed closely by magnaflow and flowmaster, with borla being the best. My last pacesetter lasted 2 years. What you'll find sets them apart is the thickness of metal, quality of welds, and quality/life of finish. Sound and performance is an entirely different subject. Best sound is often times not the best performance. There are tons of videos of different exhaust setups. All gt SEO setups will work on v6 with minor alterations such as hangers and bumper cutouts.