FAST LSX 102MM Intake Manifold Rectangular Port Fast engineers teamed up with airflow specialists at RHS to develop a polymer intake manifold for rectangular port GM L92/LS3 engines. Testing on a stock LS3 engine with Big Mouth 102mm Throttle Body produced gains of 30+ horsepower and 25+ ft/lbs of torque at the flywheel over the stock intake. The LSX 102mm Intake Manifold features a three-piece modular design that allows easy disassembly and porting. Extensive testing led to a runner design that is longer and less restrictive and gives the user the ability to remove individual runners from the manifold for modification. Constructed from the same advanced polymer material as the LSX 92mm Intake Manifold, the LSX offers a host of benefits over aluminum aftermarket intakes, including lighter weight, increased strength and improved heat dissipating characteristics. While the LSX features a 102mm air inlet that is perfectly suited to the Fast Big Mouth 102mm Throttle Body, it can also be used with stock or aftermarket 90mm throttle bodies. Other features include integrated nitrous bungs and perfect bolt-on fitment that allows the use of factory accessories without modification or clearance concerns.