A high-performance throttle body is a must if you want a throttle response that is so sharp that it will only be second to the reaction of a skilled driver. As the throttle body is a gateway to the engine's power-producing cycle, a high-performance throttle body not only allows you to minimize the delay between the driver input and response of the system but also to extract even more performance from other engine mods. BLOX Racing Tuner Series throttle bodies are budget-friendly alternatives to its line of billet throttle bodies without compromising performance. These units are manufactured from cast aluminum and are designed to fit the Honda B/D/H and F-series engines. Larger bore sizes help to optimize incoming airflow and increase horsepower and torque. Optional bore sizes: 66mm, 68mm, 70mm, and 74mm. 74mm TBs have the MAP sensor relocated to the underside—idle adjustment screw. Kit Includes gasket and mounting hardware.