This is from one of the cheaper guys that does custom tunes.
Software Tuning (ECU)
T5 - $199* plus shipping**
Stage 1 ECU only - plus 40hp
Stage 2 ECU, cat back or downpipe - plus 45-50hp
Stage 3 ECU, full 3" exhaust, viggen intercooler - plus 85hp
Stage 3+ Stage 3 and ETS intercooler - plus 95hp
Stage 4 Stage 3+ and TD04 turbo - plus 105hp