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This HSP Diesel Cold air intake will increase performance while adding a custom look under the hood of your 2013-2016 GM 6.6L Duramax LML with the HSP 502-2 LML Cold Air Intake! Featuring a 4″ mandrel-bent pipe, HSP’s intakes increase flow by removing restriction while also pulling in cold, fresh air from the headlight bezel and fender port.