JandD94

Nice Car, good luck with it.

CobraBob

2003/2004 Cobras came from the factory with 340 - 395rwhp. Average was 365. So without a tune your numbers might be more or less than someone with the same mods. Assuming yours made 365-370 from the factory, the intake and catback should have you at around 400 like FreeWilly said. Add the X-pipe and you see another 10rwhp or so. Get a tune and you'll be knocking at 425-430 to the rear wheels. You're probably not interested in a tune right now so as to keep the warrantee intact.

By the way, an catted H-pipe (MRT) has a much different sound than the X-pipe. I had a Magnaflow catted X-pipe and made about 10rwhp with it. I never liked the sound. Too exotic IMO. The MRT H-pipe retains that classic Mustang muscle sound. JMO.