With an upgraded fuel pump and/or increased injector flow rate, the stock Gen2 fuel rail has poor fuel distribution between injectors. This can make some cylinders run richer or leaner, and your O2 sensor only shows an average. By boring the main passage, and opening up the inlets and outlets, we greatly improve distribution and overall flow capability. Tested up to 360whp with 550cc injectors.

Gen2 only, does not fit Gen3.

Return your stock rail for a $100 refund.