13B-T FC3S Secondary Fuel Rail The diffusers must be removed. Includes Lower O-Ring Inserts Fits: 86-91 Mazda RX7 (S4 and S5 13B-T) 1/2″ Bore – Suited for high horsepower needs O-ringed end fittings – No more Teflon tape/worn threads! Centering Spacers – Ensuring injectors are centered for no air/fuel leaks Stainless Hardware – High strength/corrosion resistant
