This Radium Engineering CNC-machined fuel rail converts the primary injector location on the Mazda 13B rotary to top-feed injectors using the included injector seats. It accepts common aftermarket universal injectors and features 8AN ORB ports.
| Type | Top-feed fuel rail (primary) |
| Ports | 8AN ORB |
| Injectors | Top-feed (seats included); universal aftermarket |
| Application | Mazda 13B, primary injector location |
| Part Number | 20-1113 |
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