Staying just below 400rwhp 2002 gt auto?

[Mob79]

I'm new to stangnet.com I figured I could get a lot of questions answered here. I had big aspirations for my 2002 mustang gt but to go beyond 400rwhp I would need a forged steel stroker kit and that gets crazy expensive so I decided to stay below the stock capacity of 400rwhp, my question is what mods can I do to get just below that 400rwhp in N/A form. So far I have bbk cai. 70mm tb C and L upper plenum. Steeda underdrive pulleys. Bbk ceramic shorty headers. Bbk 2 cat high flow x pipe American thunder flow master catback. Transgo shift kit. And a bama tuner running 91 octane performance tune. I live in california so I'm sure I'll have to get around some things to get just below 400rwhp.

 

[R4ymond]

A set of cams would help.
Im new to the mustang world and idk if they work well with E85 but that might be an alternative to gain a few more hp.
also dont forget that beautiful exhaust law XD