Unless you upgrade the exhaust, as in headers, or at least opening up the exhaust manifold outlet to 2.25" or 2.5", you'll not see much of a difference at all. If you put more in, you need to be able to get more out and the stock 1 7/8 exhaust pipe ain't gonna get it done.
Also, while a decent article, that article up there ^^^^ is way biased towards its sponsors. Even doing everything they did, you ain't gonna see a 77hp increase still naturally aspirated. 50-55, I could see.
