Originally Posted by Oranoco
TBH I don't think there is any mechanical difference between the Si and GTi apart from some half leather seats and some bumper spats.
My bro's other half has a nice '98 GTi and with some go faster goodies it made 143bhp at a rolling road day on a DynoDynamics rolling road
My old n-reg si didnt have abs, the GTi has though, apart from that i think the engine and running gear is the same