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It was now time to get serious, as we moved onto the FAST LSXRT 102mm intake manifold. This bad-boy is designed for serious LS1, LS2, and LS6 engines, but with its relocated higher throttle-body mount, it will bolt right into a '99+ GM truck with cathedral-port LS (4.8, 5.3 and 6.0) heads. We were curious to see how the intake would work with a stock internal and stock head-equipped LS engine. Along with the intake, we ordered the FAST billet high-flow fuel rails and throttle body adapter bracket that will mate our 75mm factory throttle body.