my car ran a superchips chip,T28 hybrid, 4 bar fuel reg, uprated fuel pump, exhaust, air filter and got 298bhp 310lbft @ power engineering
so good power is possible
mine having a management change now, if your after a fuel pump,4 bar fuel reg i have them here, the chip i will get when i pick the car back up if your interested in that too

mines a 'COSSY' ecu