im just wondering and wanting to know the answers to a couple of silly questions

1) standard rx7 power output is 255 BHP (engine power output) what is that at the wheels?

2) im about to add a few mods to my rx7 (crooked willow large standard mount intercooler,, blitz airfilters, greddy elbow, HKS downpipe and apexi FC) and looking into running 12psi after i port the wastegate and buy a boost controller,, what sort of power am i looking at there both engine and wheel power?

3) after these mods im looking at getting rid of the emmsions crap including airpump and running a full unorthodox pulley kit,,, replacing the main cat with a mid pipe (hopefully boost will behave and be under control) again what sort of power am i looking at ,,, engine and wheel power?

4)the next step, i think will be to wind up the boost to maybe 14/15psi and buy fuel mods,,, maybe pump ,,injectors,,,, is this correct? and again what sort of power am i looking at engine and wheels

what are the limitations of the RX7 power output,, i know the twins can only flow soo much boost so at this point im looking at either a big turbo or upgraded twins,,, im wanting 400BHP at the engine (i get the feeling at that power the car will be a massive improvement over standard set up.)
thanks for all replys