H&S 409901 Fuel Rail Shim Kit

This kit will help keep your fuel release valve from opening prematurely on vehicles with high performance tuners or power modules. If you have experienced one or both of these codes : P1011, P0087, then you will need to purchase this rail shim kit. H&S Performance chips will raise the fuel rail pressure, and will sometimes cause the fuel rail release valve to open prematurely, throwing the above mentioned codes. This FRS-6.7 will add more spring tension to the valve, causing it to stay closed under slightly higher pressure.