Jonto,
ive a classic shaped turbo with PPP and scoobymania downpipe (plus uprated alloys and brakes) running 15psi (263bhp and 243lbs of torque).
As for the PPP on the STi7 type UK, i wouldnt really go the way of ecutek on that, simply because the warranty is worth much more than a few hundred quid and 300bhp and 300lbs of torque is quite nice (plus you wouldnt really gain too much beyond that with an ecutek, maybe 5% more but for something you wouldnt really notice alot of the time...... Unless its a JDM STi7).
Tony