I have the full kit. I have dynoed the car 3 times on 3 different dynos and got the following results:
KB tune. 401 hp 411 tq.
SCT tune: 416hp 428 tq.
SCT tune 2: 417 hp 434 tq.
Mods are in sig. I was running very lean on the kb tune (13.5:1 at 4k rpm when we let go) so I decided to get s custom dyno tune. Now I am planning on getting a smaller pulley... 10, 12 and 14 psi ones.... I will let you know what the AF etc is like and when the engine gave up.....I have a new engine being built as we speek so I just want to see how much abuse the stocker can take... I don't believe in the 9 psi being the limit.
There's nothing wrong with his car, you have the big tube option and a full exhaust. without it, you would have likely made about 15-20hp less.....which is about right on the money for a stock Auto equiped Stang with a base 9psi KB kit.