First and foremost before you waste 600 bucks on intake and exhaust (depending on what you buy that can easily turn into 1600 bucks) buy an ECU upgrade from APR or GIAC (
APR - High Performance Development for Audi, VW and Porsche Vehicles. or
GIAC - Automotive Performance Software Tuning) and buy an upgraded diverter valve. Save the money from the intake and put a K&N panel filter in your stock air box and cut apart the lower portion to let in more air. For the same 600 bucks you'll have about 30 more horsepower and about 60 ft lb. of torque more.
