I've been told by one of the programmer co's that if you have a cai w/ tune i.e., Steeda and axle back installed on your car … save your money. The dyno isn't really going to improve anything. If you have some serious mods done to your engine, go for it then.
Sort of true if you have a stock cat with just the CAI installed. Mind you, for this pull on m almost new '05 GT (5-speed BTW), I had a Steeda CAI, JBA shortys, Magnaflow Tru-X Pipe with high flow OBDII cats and JBA rear muffs installed for the tune-up, the most typical bolt-on stuff. With the Steeda Predator tuner's 93 ocatane CAI program the car was VERY lean, 14.5-15.1 using the upstream bung of the headers.
When I had my '05 GT dyno tuned the peak numbers didn't change by more than 5-6HP but the area under the curve grew quite a bit in the midrange. The improved mid-range numbers were up 16HP and 12ft/lbs., not bad for adding fuel and timming. This is good usable torque you can feel around town.
Most people have had good fuel numbers with Steeda's CAI and Steeda Predator CAI w/93 octane fuel tunes. My car was really lean probably due to the very free flowing exhaust system.