Street legal for late-model 5.0L Ford Mustangs. 65mm size is ideal for stock manifolds. 70mm is the optimum choice for the Performer 5.0/Performer RPM 5.0 EFI intake and The Total Power Package (70mm gained 10 hp over stock throttle body). 75mm is intended for more radical engine combinations and requires port matching to fit most manifolds. 1986-93 throttle bodies must be used with matching EGR Plates. Gaskets are included. 50-state street legal.