Radium Engineering Fuel Rail | 2006-2009 Honda S2000 (20-0391)

The AP2's F22C revs to the moon; its fuel rail should not be the part working hardest to keep up.

The Radium Engineering Fuel Rail for the 2006-2009 Honda S2000 is the upgrade-rail treatment for the late AP2: a large 0.69" diameter internal bore supporting all necessary engine power requirements, CNC machined aluminum, anodized and laser etched. As a Radium upgrade rail, the injector interface matches OEM, so factory injectors reinstall directly and any injector upgrade must be OEM-equivalent in height and O-ring dimensions. Boosted and built F22C engines get the rail volume and port access the factory part never offered.

What You'll Feel

• Consistent fueling to 8,000 rpm and beyond, with the 0.69" bore holding pressure steady across all four injectors
• Rail headroom ready for the supercharger or turbo the S2000 aftermarket loves
• Factory injectors reinstalled without drama in OEM-spec bores
• Port access for the plumbing, damper, or gauge the build calls for
• Hardware that matches the precision of the engine it feeds

Features

• Large 0.69" diameter internal bore supporting all necessary engine power requirements
• CNC machined aluminum, anodized and laser etched
• Upgrade rail: OEM injector interface, factory or OEM-equivalent injectors only (matching height and upper/lower O-ring dimensions and styles)
• Application-specific for the 2006-2009 S2000 (F22C, drive-by-wire AP2)

The Details

Radium's rail taxonomy draws a clean line, with upgrade rails preserving the OEM injector interface and top feed conversion rails changing injector styles entirely, and this S2000 rail is the former: injector upgrades must match OEM height and O-ring diameters and styles, with flow rates chosen by your tuner and exact part numbers confirmed with the injector manufacturer, since Radium makes no injector recommendations. The 2006-2009 model years matter here because the late AP2's fuel system differs from earlier cars, which use Radium's separate 00-05 rail. Plumbing completes through Radium's adapter fittings sized to your lines, and the usual O-ring disciplines apply: lubricate before installation, no sealant on ORB threads.

Kit Includes

• 1x Anodized, laser etched aluminum fuel rail
• Mounting hardware
• Injectors and adapter fittings NOT included

Applications

• 2006-2009 Honda S2000 (F22C, AP2)
• Factory or OEM-equivalent injectors only
• Earlier 2000-2005 cars use Radium's separate S2000 00-05 rail