Design by CNR, these directly bolt-on throttle bodies are larger than stock throttle bodies for increasd air flow. bolt on to the stock manifold with mounts for stock sensors and vacuum lines. They are the best choice for accurately controlling airflow but are also engineered to work perfectly on an OEM intake. The large bore area is capable of enough airflow to supply full tilt alcohol and turbocharged drag engines. Made from CNC-machined T6 Aluminum Alloy. All units are designed as a direct-replacement, and require no other modifications. Comes in 65mm, 70mm, 80mm, 90mm true bore sizes. These units are good for huge horsepower increase along with improved throttle response.