Money isn't a big issue but, I'm not looking to spend a grand on header. Maybe around 500 less. I'm building an Auto-Cross car so what you guys are telling me I should get a 4-2-1 header. I don't know what I'm going to do with the car eventually so I'm thinking maybe a 4-1 header would be a good all around performance plus. What exhaust are you guys running? I've heard great things about the Greddy Evo 2 Exhaust and I am seriously considering purchasing it. Although I don't want to lose my low-end torque if I get a new exhaust. Auto-Cross is all low end torque sport but, the GS-R's aren't well known for their low end unlike the LS, RS, GS, SE models. I'm probably going to run a stock intake box also with a K&N Filter.