I like mine from
www.buckshotracefab.com
Here they are with 17 inch wheels on the car.
Here's how they look in motion with 2100 ft air.
Buckshot Racefab side pipes in motion
Here's a recent dyno chart
475.3 wheel HP
If you get some I should mention the new pipes required an additional 3 jet sizes up primary and secondary to maintain the same air fuel ratio as the Superformance side pipes.