To get to 450hp you need exhaust, downpipes, new fuel pump, manifold, intakes, plugs, bi-pipe, and a few more...not to mention that's actually 2 K04 turbos at $3000 a pop...if you do it yourself, you can tune a stock for about $10K to 450hp...STI's and Evo's still have a better chance condisering S4's weigh in at 3700 lbs!