FASS Fuel Systems Titanium Signature Series Diesel Fuel System 165GPH GM Duramax 6.6L 2011-2014 (TSC11165G) engineoil the CP4 has proven to

the CP4 has proven to be less reliable and less capable than the CP3 used in previous Duramax platforms

Increased Throttle Response

LOOK UP A VEHICLE

FLO~PRO has made the necessary changes to ensure easy installation as all our exhaust kits come with necessary clamps

Increased Coolant Flow

FASS Fuel Systems Titanium Signature Series Diesel Fuel System 165GPH GM Duramax 6.6L 2011-2014 (TSC11165G) engineoil the CP4 has proven toFASS Fuel Systems Diesel System 2011 2014 GM Duramax LML 6. 6L Titanium Signature Series 165GPH (TSC11165G) Part No: TSC11165G A FASS Fuel Systems can be a beneficial upgrade for your GM Duramax LML diesel engine, this is because your Duramax doesnt come with a factory System like other diesels. This requires your CP3 injection System to pull your fuel under a vacuum, adding additional stress to your CP3 System and risk introduce additional air into