BBK Performance throttle bodies are designed as a direct replacement for the restrictive stock factory throttle body. All BBK Power Plus throttle bodies offer OEM drive ability but with up to 30% improved airflow for improved horsepower torque and throttle response. Every BBK throttle body is CNC Machined from a new high quality 356 aluminum casting and assembled with features like OEM style die stamped throttle linkages double sealed bearings and o ringed throttle shafts to make every BBK throttle body the best on the market today. All BBK Performance throttle bodies are designed to improve performance and they work with the vehicles factory tune. No tune is required and BBK throttle bodies are available for many late model American muscle cars and trucks. 75mm recommended for well modified applications.