With a little help from our friends at Tune Time Performance, we were able to find a willing TrailBlazer (owner Jim Skeenes) in which to test the new FAST (Fuel Air Spark Technology) truck intake manifold (FAST LSXRT 102mm cathedral port). Let us begin by saying this was the most impressive stock replacement-type intake manifold we ever tested. Having a forced induction (turbo) combination to enhance the higher airflow volume of the FAST truck intake certainly helped make for huge power gains. However, the LSXRT intake is clearly taller and has longer runners, which enables it to move a greater volume of air than the LS3 and LS7 car intakes. We could see using the LSXRT intake on a LS-powered car (like an '80s G-body) without the hood/cowl clearance concerns to maximize engine performance on a cathedral port combo.
Recent tests with the FAST LSXR 102mm on Tune Time Performance's supercharged 2010 Camaro SS produced some great results. However, the notoriously tight engine bays on late-model F-bodies and Corvettes, which also have limited hood clearance, restricted the runner length (and shape) that FAST could design into its car-designated intake manifold, which adds high-rpm horsepower (above 5,000 rpm) without the massive mid- and low-end benefits of the truck version. We were anxious to test the FAST truck piece knowing it would boost mid-range torque like an old tunnel-ram manifold of yesteryear. Trucks and SUVs really benefit from bottom-end torque and a broadened power curve to get their added weight rolling. That's a good reason why the stock GM truck intake is taller than the car unit.
Eventually, down the road we'd like to see a four-way shootout (engine dyno) on both the stock intakes (car and truck) and the FAST units using a popular build-type LS engine. Each intake would demonstrate the gains in the power curve to help determine the right intake choice for the intended combination (gearing, converter, weight, etc). For now follow along and see how admirably the FAST LSXRT 102 intake performed in this test. As a side note, we think a naturally aspirated LS2 would have shown roughly half the gains we realized using a boosted TBSS. Still, half the gains are impressive numbers from just an intake swap.