lots .... lol the main things were vortech super charger running 15 psi and NOS .... also had cams, low comp 2.9 bottom end, united motorsports ECU chip, light weight pullies, light flywheel, 3 inc exhaust .....
i had 380 bhp and managed to get the power down ok ish ... but i did have an LSD gearbox and R888s on the front so that did help but anything over that would be hard to get grip ....