TOSHI, CEFFIE on these forums.
Can both do this sort of shit for these sort of dollars.
the fact is, if it's using stock Injectors, stock AFM, they can use one of their generic chips that they would have.
I'm sure both have the ROMs to match an RB20 with (eg) 12 psi, stock injectors, afm and stock turbo and then another which has the above but with rb25 turbo... etc..
and they can both remove the speed limiter and raise rev limit if you want..
Just drop the guys a PM and ask some questions.
they are both very heplful