FAST Big Mouth 102mm Throttle Body When it comes to improving your engines performance, increased airflow is a key ingredient. The FAST Big Mouth Throttle Bodies for the FAST LSXR & LSXRT 102mm Intake Manifolds increase airflow through a series of innovative design changes and an enlarged throttle opening. FAST also invested significant testing & engineering resources into optimizing cross-sectional flow and eliminating airflow turbulence, especially at part throttle operation. In addition, these throttle bodies offer increased throttle blade thickness to eliminate deflection commonly found with other throttle bodies, especially those in boosted applications. A smoother operating offset blade pivot improves throttle response, and a beefed up linkage and dual throttle spring mechanism ensure total throttle control. The FAST Big Mouth 92mm Throttle Body will deliver bolt-on GM Gen III (LS1, -2 & -6) horsepower while the 102mm version is designed to maximize potential performance upgrades on all Gen III and Gen IV engines with cable driven throttle bodies. Big Mouth 102mm Throttle Bodies also feature CFD optimized convolute bores to maintain low speed driveability. Perfect addition when purchase one of our FAST 102MM Intake Manifolds.