Manufactured with a large internal bore, the fuel rail can support all necessary engine power requirements. They are CNC machined from 6061 aluminum, anodized, and laser etched for a high quality surface finish. Like the OEM fuel rails, the injector bores are 11mm ID so factory injectors, or any equivalent aftermarket injector, can be used. 
There is a provision to reuse the OEM fuel pressure regulator (FPR). If not using the OEM FPR, there will be an open 1/8NPT port that can be used for ancillary sensors, or it can be plugged. Shown in the 1/8 NPT port below is a 20-0029 Fuel Pressure Gauge with a 14-0339 1/8NPT Male To Female, 90Deg elbow. These can be found HERE.