use a standard up rated turbo ,3 bar, 803s ,stage 3 chip can be tailored for torque if you wish ,try harvey gibbs motor sport on 01733576614, it sounds like you already have a stage 2 graham goode set up ,as he is renouned for using 355 injectors ,also i have found a supplier of 803s at £50 ea and 3 bars at £70 ea