RE54

hi, new to the site, and was hoping to get some advice on tuning and upgrades. i was told its 330bhp with the following parts...(might have missed a few bits)

803 green injecotors
3bar map sensor
pace RS500 intercooler
mongoose exhaust
big air filter (unsure of brand)
samcos

what are my options to increase this. the car has done 95k, and im unsure of any previous engine work, so for peice of mind i wanted to get it all sorted. aiming for 380+ or maybe more depending on reliabilty and cost.

car is off the road having all new bushes,hi spec brakes, and other odd bits.

thanks, rez