I have a set of stainless side pipes from
www.buckshotracefab.com , 4,000 dollars
, for my Superformance. They're ok, louder, more power. It took three jet sizes up to match the air fuel ratio of the Superformance side pipes.
Here's a large res. image.
http://www.clubcobra.com/photopost/d...rive_pic_3.jpg