Variable valve timing adjustment
Rev limit adjustment
Boost limit & level adjustment
Dual maps for use with different fuel grades & types
Water Injection
Nitrous oxide progressive injection
Bigger/supplementary injector handling
Variable induction control
Launch control for turbo vehicles
Full throttle gear changes
Road speed limiter removal
Speedo conversion for imports
Shift light
Idle speed stabilisation
taken from the DASTEK site
http://www.dastek.co.uk/features_unichip.htm
hope that helps mate and here's the wireing diagram
http://www.toyotagtturbo.com/forums/showthread.php?t=39333