Mazda Series 4,5 13B Billet EFI Fuel Rails - Black AF64-2213BLKMazda Series 4,5 13B Billet EFI Fuel Rails BlackSuit 14mm 3 4 Length Fuel Injectors, 8ORB Ports AF64 2213BLK 64 2213BLK New design Aeroflow Performance Mazda rotary fuel rail to suit 13B engines in series 4 and 5 Mazda RX7. The high flow primary and secondary fuel rails have an integrated one piece bracket design. Each rail features female 8ORB ports on each end and a large internal bore to support all necessary engine power requirements. Aeroflow