Radium Fuel Rail, Subaru Top Feed Conversion, V1-6, No Fittings

This fuel rail conversion kit is compatible with the Version 1-6 Subaru STi 4-cylinder engines.

The 20-0335-01 kit includes enough to plumb the rails in "Parallel, Flow-Through" or "Series". Refer to the More Details tab above for more information. If -8AN male fittings are required, they can be purchased here  . Two of the plugs can be used if the fuel rails will be plumbed in "Parallel, Dead End", as shown. The other two plugs can be used for the lower center ports if a fuel pulse damper is not used.

NOTE: Neither fuel rail kit comes with hoses. 

Do I need a pulse damper?  

The opening and closing of the injectors creates pressure pulses in the fuel rail, which can lead to unstable fuel pressure. In order to achieve a safe and consistent rail pressure, a pulse damper should be used (especially with high flow injectors). The internal diaphragm will absorb oscillating pulses and stabilize fuel pressure. This correction can be measured throughout the RPM range and can often help an erratic surging idle. 

The optional Radium   fuel pulse damper can be used in any of the three -8AN ORB ports on these fuel rails. 

Want to reuse the OEM Subaru FPR?

If the OEM 2-bolt flanged FPR will be reused, select one of the OEM FPR options above. The   OEM FPR adapter is commonly used with EJ20 engines and   is used with EJ25 engines (excluding STi). MEASURE YOUR OEM FPR BEFORE ORDERING. These adapters can be used in any of the ports and permits properly clocking for appropriate fitment.