if money is an issue, i would recommend a vr6swap for your car..

you can find the full set-up for A3 for under 1000$ these days now.matter of fact,there was a guy in chattanooga selling his whole GLX for 700$.72K miles..got rear ended.if your insterested, i can email him to see if he still has it .

u can supercharge the 8valve but you'll be about as fast as a stock VR