Dual Feed Line The Dual Feed Fuel Line by Industrial Injection increases fuel volume to the common rail fuel system. Industrial Injection’s Dual Feed Line is a flexible auxiliary fuel line that routs from the CP3 injection pump to the common rail.  You can expect a 50hp to 70hp increase and will cut rail pressure recovery time in half.  This product will work with the Duramax high pressure fuel systems and it’s a perfect addition to the Modified CP3 fuel injection pump. Cost: $300.00