Actually aftermarket intakes go for less than an unported bullitt intake with the install kit to put it on with they go for about 1600 or more, you can get an aftermarket for around 1100~ complete, and it actually ADDS horsepower with no porting needed to it. A larger tbody and ported stock or aftermarket upper intake plenum will net you MORE gain than an expensive bullitt intake swap.
Rick Kilpatrick, AAS Automotive Systems Tech, Alamance Community College, Class of 99. 06 5 speed manual Mustang with Pony pkg : GT Mac Mufflers, true duals with one custom pipe. 2.5" system. GT bumper cover, all installed March 7&8 2006. AFE Stage 1 CAI, Motoblue Underdrive pulley, GT aluminum shifter knob, honeycomb rear blackout panel,and dash kit installed. Roush hood scoop and side window louvers installed. SS taillight trim has been installed, new alum. GT steering wheel installed.