Increase horsepower and torque with this 3/4 inch throttle body spacer. Tests on a 06 Civic Si [shown below] produced a 4.5 horsepower gain at the wheels! Our spacer comes equipped with a 1/8th inch NPT threaded port at the bottom that can be used as an extra vacuum port or nitrous. Includes extended bolts, plug, and is polished to a brilliant show-quality shine.