Is it going on a mk4 golf 1.8t?Have you already got a fmic, good turbo back exhaust system with sports cat, tip, upgraded injectors/fuel pump/fpr etc etc etc?If so give R-Tech a call mate, well worth travelling down, service is excellent
here's a graph of one they've done with a T3 turbohttp://www.golfgtiforum.co.uk/index.php?topic=172024.0