Listen to Linn. I had to drop $8k into the engine to reach 450rwhp na. I'm thinking if I didnt have an auto and rear the car would make about 475ish rwhp. To make 500 I would have to go no smaller than an MS3, get better heads, port the manifold, and lean out the tune a little. Thats another 3.5k in parts, time, and labor. Those iron blocks are great (thinking of getting one myself) but they also add weight to an already front heavy car.