Big Throat Borla Throttle Body 60mm 280Z 280ZXNew Borla big throat throttle body for Datsun 280Z and 280ZX. This 60mm throttle body is designed to replace the original equipment units on Datsun 280Z and ZX models. Dynamometer tests have shown improvements in torque and horsepower in the mid and higher engine RPM ranges on otherwise stock engines. We do recommend minor modifications to the stock inlet manifolds to maximize the performance potential of these units. When used in conjunction with