I agree that the Bahn Brenner supercharger will get you more power, but the Neuspeed supercharger setup is commonly found for $1500 used, and it brings you close to 150whp. If you really need a lot of power, you could follow my plan: I'm planning to build up a 2.0 with new pistons,rods etc. and twincharge it. That means I'm going to have both a turbocharger and a supercharger on the car. The turbo will be larger and won't spool until 3000 rpm or so, but the supercharger will provide more power until the turbo spools.
