20-0428 2017+ Honda Civic Type-R Radium Port Injection Kit

The Radium Port Injection Kit fits 2017+ Honda Civic Type-R. Part number 20-0428.

Features

• PIK adapter plate installs between the intake manifold and cylinder head
• Custom fuel rail: 0.63" internal bore, CNC machined extruded 6063 aluminum, laser etched, 4x 8AN ORB (3/4"-16) ports
• Injector positions machined at a specific angle for proper spray into the intake ports
• Machined phenolic mounting spacers and washers completely isolate the rail from cylinder head heat
• Designed for specific top feed injectors with matching upper and lower O-ring spacing
• Does NOT replace the OEM direct injection system; all fuels including E85; OEM Honda gaskets included

Kit Includes

• 1x PIK adapter plate
• 1x Custom port injection fuel rail (4x 8AN ORB ports)
• Fuel rail mounting hardware with phenolic spacers and washers
• OEM Honda gaskets
• Injectors, fittings, plugs (14-0150), plumbing, and controller NOT included

Applications

• 2017-2021 Honda Civic Type-R FK8 (K20C1)
• 2023+ Honda Civic Type-R FL5 (K20C1)
• Top ports require 14-0150 plugs unless the OEM harness carrier is modified

Feeding the Second Stage

Port injection needs its own regulated supply, and on the FK8 that problem is already solved upstream. The Radium fuel hanger plumbing kit for the 2017-2021 Civic Type-R (20-1085-03 / 20-1085-05) uses a dual fuel pressure regulator with two independent outputs: the black knob regulates the OEM direct injection low pressure feed, and the green knob governs a second regulated outlet that ships plugged from the factory, reserved for exactly this kit. Connecting the two takes an 8AN ORB DFPR adapter fitting and a fuel line.

• Fuel hanger plumbing kit, FK8 (20-1085-03 / 20-1085-05): DFPR, gauge, filter, and full tank-to-firewall plumbing with the port injection outlet built in
• Fuel pump hanger, 2016+ Civic (20-1080 / 20-1082): the in-tank supply supporting one to three aftermarket pumps