CSF Oem+ Replacement Intercooler For 2017-2018 Gm 6.6l Duramax L5p 6079 CSF Oem+ Replacement Intercooler For 2017-2018 Gm 6.6l Duramax L5p 6079 Ships to Continental US Only. The CSF 6079 OEM+ Replacement Intercooler is a step up from the factory intercooler in your 2017-20118 GM 6.6L Duramax L5P. CSF is an... MSRP: Was: Now: $425.25 Out of stock. Please Call For Availability