Eaton Supercharger M112 with an Apten port with smaller 2.76 Pulley - Made 480 RWHP on stock '03 Cobra Motor (with intake and exhaust). Easy swap for the current '03/'04 Cobra owner - quick bolt on for more power!
If you have to ask 'will this fit on my car', it more than likely will NOT, and you do not have the technical expertise to do it anyway, nor will your mechanically inclined friend want to do this for you. As mentioned above, this is a perfect swap for the current 03/04 Cobra owner that wants to increase their horsepower with a simple swap and does not want to spend $4000 for a new Whipple or Kenne Bell Supercharger kit.
With exhaust and intake this supercharger with a 'tune' made 480 Rear Wheel Horsepower on 'pump' gas (93 octane) - I also have the chip with the switch that I will throw in for another $100 - this will save you the time to have to tune the car - (disclaimer - if you have different modifications that the original tune on the chip calls for, the only safe alternative would be to have it checked to make sure it is safe).
Want to knock of another $100? swap me the original stock Eaton from your car. Need it installed? - I will install in for you for $150