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FASS 01-10 GM 2500/3500 Duramax 165gph Titanium Series Fuel Air Separation System TS C10 165G 'Safety' AFe Control Suspension products areFASS Fuel Systems Diesel System 2001 2010 GM Duramax 6. 6L Titanium Signature Series 165GPH (TSC10165G) Part No: TSC10165G A FASS Fuel Systems can be a beneficial upgrade for your GM Duramax 6. 6L diesel engine, this is because your Duramax doesn't 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