Last year at the Ford Nationals many vendors had there exhaust on display and on cars, The loudest and best sounding in my opinion is the Borla Atak, but if you don't want to spend that kind of money, or are on a budget I recommend Pypes Axle Back, many places have it for under $300 and you can install it your self. I have it on my Boss 302 and I love it. The Ford National is in June if you can wait, go and listen for yourself and Borla was doing free installation there too! Good luck !