I dunno, but last night I helped a buddy of mine install some stingers and a JLT cai on his 04 mach 1 and it sounded great and definitely noticed a huge difference on the butt dyno.
there are quite a few vids of them on 03/04 cobras on youtube. all i typed was sn95 cobra with borla stingers. and got lots of vids. they sound pretty good