So i have this 09 Mustang GT/CS been reading around and finally thinking of maybe getting the corsa axle back exhaust hear it gives 13 hp not sure if it real does. Also planning on getting CAI + Tuner thinking of going with steeda and SCT XCalibrator 3 and some steeda underdrive pulleys. Wondering which one i should do first or if any recommendations on better exhaust or CAI + tuner combo or pulley set up. And does anyone know if this will run me into any kind of trouble as far as dealer wise since i purchased the extended warranty at pretty ford for free tune ups and oil changes, on my last 05 i got at mossy ford a lot of things went bad and had to trade it back in but that one i had off road h pipe so off the get go dealer gave me crap about it. Any suggestions and input about the dealer giving me any type of crap if i do any of the above steeda said i should be fine as far as warranty goes.