to get those power levels or close u would need to have a computer that can alter air/fuel ratios wich is were most of the power gains come from. so not any computer system or add on computers can do that. most of the complete replancement style cpu's will alow u to alter air/fuel rations like the apexi power FC, wich i reakon is the easiest to use for a rb26dett because it works wif the factory air flow meters n wiring looms.
if u upgrade to the hks 2530 turbos u can still use the power FC which is the beauty of it.