If you mean 03/04 Cobra these are usually the first and best mods. CAI: JLT or K&N FIPK seem two be the best ones. Any catback of choice. Boils down to your choice of sound. They are all about the same for hp/trq.
I usually drive a black 01 GT with a grey-silver banshee shaker hood, and an Metallic Silver 04 Cobra. I live in Lebanon but come to Springfield often.