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General Motors GM-46091 Inner Cooler Pressure Tester 6.6L Duramax Shop By Category > Engine>Camshaft Tools Drill America D/A21J-SP-SET 1/16 -General Motors GM 46091 Inner Cooler Pressure Tester 6. 6L Duramax Kent Moore Tool Number: J 46091 The GM 46091 Charge Air Cooler Tester has been used to test induction systems on vehicles equipped with a 6. 6L Duramax diesel engine since 2001. Various adapters to this base Tester have been developed as vehicle and powertrain changes have occurred. For the 2017 model year the new engine RPO L5P has exhaust pipe changes that require a new test adapter.