Airflow engineers at RHS® and EFI specialists at FAST™ recently worked hand-inhand to develop a superior intake manifold for GM Gen IV performance applications. Designed for L92/LS3/LS7 engines using the latest RHS® design technology, the LSX_R™ features a three-piece modular construction to allow for easy disassembly and porting. Extensive testing led to a runner design that was longer and less restrictive, allowing the removal of individual runners for modifi cation. Dyno tests produced gains as large as 16 horsepower and 18 ft/lbs of torque on a stock engine with a mild camshaft. Additional testing on a 500 c.i. engine netted even more impressive gains of 26+ rwhp.

Constructed from advanced polymer material, the LSX_R™ is lighter, stronger and more heat resistant than comparable aluminum intakes. While it features a 102mm air inlet, it can be used with 90mm or 92mm throttle bodies. Other features include integrated nitrous bungs and perfect bolt-on fitment, allowing use of factory accessories without clearance issues.

When it comes to improving performance, increased airflow is a key ingredient. Available in 92mm or 102mm diameters, the Big Mouth Throttle Body™ increases airflow through a series of innovative design changes and slightly enlarged throttle opening. Significant testing and engineering was conducted to optimize cross-sectional flow and eliminate airflow turbulence, especially at part-throttle operation.

The throttle blade's increased thickness eliminates deflection, especially in boosted applications. To improve throttle response, the blade pivot is offset, while the beefed up linkage and dual throttle spring mechanism ensure total throttle control.