FAST engineers teamed up with airflow specialists at RHS to develop a polymer intake manifold for rectangular port GM LS7 engines. Testing on a modified LS7 engine with a Big Mouth 102mm Throttle Body™ produced gains of 31.3 horsepower and 26.6 ft/lbs of torque at the flywheel over the stock intake! Constructed from the same advanced polymer material as the LSX™ 92mm Intake Manifold, the LSXR™ offers a host of benefits over aluminum aftermarket intakes, including lighter weight, increased strength and improved heat dissipating characteristics. While the LSXR™ 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 or 92mm 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. Fits LS7 Raised Rectangle port cylinder head equipped applications (LS7).