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Just a header? 1, maybe 2 hp.
As they said, your exhaust system is exactly that- a system. Upgrading the stock exhaust manifold to a 4-2-1 header will help, but you still the problem of that nasty 1 1/2" exhaust piping, creating a bottle neck.
Think of it like this. You've got a gallon of water flowing down through a pipe 1 1/2" in diameter. Now, you dump it through a traffic cone, in through the large opening, out through the small. Does the water reach the ground any faster? Not really. While the large opening in the traffic cone may be a foot across, the small opening is that same 1 1/2 inches. Now take a pipe 2 3/4" all the way through- that's how you're going to get the best flow.
You'd be better off taking that $130 and getting a generic intake.
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