Being horsepower junkies, we couldn't wait to try the new FAST LSXR 102mm intake manifold (PN 146102). It has show gains of 16 and 26 hp on 376ci and 500ci LS engines respectively. We saw a gain of 4 rwhp from 5,500 to 6,800 rpm. We lost an average of 8 horsepower from 2,500 to 5,000 rpm and decided to track test the car with the factory intake reinstalled. This is not an indictment of the FAST piece. We just didn't have enough engine to take advantage of it.