So I have a 2014 GT with airaid intake and Borla S-type axle backs. I am looking to possibly do one mod and it may be another year before the next follows. I am looking at either the CJ mani setup (Cobra jet manifold, intake, throttle body) or some Kooks long tube headers or similar quality headers. I really would like to do the Cobra Jet setup first. But is adding this with a basically factory exhaust going to be pointless? Does anybody have a Cobra Jet setup with axle backs only and had decent results??