easier way would be a tt kit, im runnin about 210bhp ish tt conversion, if you get a kit, on a good xr or rs engine i could get a reliable 180bhp, or give me your car, a tt kit and 3 days, and all be runnin a sweet beat of low 14 sec 1/4, but you do really need a rs lsd.
mk2 take it too a place with proper timing gear, eg pod or similer place, trax is ment to be not 100%, but i might be wronge.
cheers danny