do a pulley swap on the supercharger, and underdrive pulley set, longtube headers, off road h-pipe, and a tune should help out alot and should run your bank account into the ground
I don't think that underdrive pulleys are necessary for the 03/04 Cobras. If anything they'll rob you of power. Do your research on that one. The only thing I did was double bearing idler pulleys w/aux pulley,and a 4lb lower crank pulley. With this combo on a stock eaton will get 450-480 rwhp. A ported eaton you'll get low 500's.