Fitment and Product Information. Fuel Pressure Regulator Inline Fuel Pressure Regulator 4-12 psi. Brandname: Magnafuel Part Number: MP-9633-Blk Product Details. They feature a durable metal-to-metal seat for instantaneous response and low maintenance. Two and four-port configurations are available. The boost-reference models provide a 1:1 compensation ratio. They’re suitable for drag racing, Circle Track, road racing, […]