Ok folks, make my car go faster ...

but... and its a big BUT (Like J.Lo)
Im 19 and dont wanna do anything where I gotta tell the insurance, so big exhausts and K&N Induction kits are out...
So, what else?
Well, Im gonna put some Bosch Super 4 spark plugs in... but what else can I do?
I hear u shout what car, and incase u cant see my little image below, its a '97 P reg VW Golf GTI 2.0 8v mk3...