JBA p/n 6651S headers are designed to fit ‘64-1/2 - ‘70 289/302 (not Boss) Mustangs equipped with 4 spd manual or C3/C4 automatic transmissions. These headers are not designed for 5spd applications. These headers provide significant increases in torque and horsepower throughout the RPM range and allow for maximum ground clearance. Stainless steel finish