Sinister Diesel Coolant Reservoir Cap 17-23 GM 6.6L Duramax L5P PUT-402621BPFD Airaid Performance Oil Forms an

Airaid Performance Oil Forms an additional line of defense against dirt without limiting airflow

available for Standard Output or High Output engines in Raw

Protect your engine with the Sinister Diesel Coolant Filtration kit

this system includes OEM quality cast iron rear blocks that do not sacrifice ride quality

Pre-set check valve at 18psi

Sinister Diesel Coolant Reservoir Cap 17-23 GM 6.6L Duramax L5P PUT-402621BPFD Airaid Performance Oil Forms anFrustrated by the fragile plastic reservoir cap on your Duramax? Time to bite the billet and upgrade to Sinister Diesel's billet cap. The Sinister Diesel Coolant Reservoir Cap for your L5P Duramax is a high quality replacement billet cap designed to replace your factory cap. Made from high strength billet aluminum, this cap is build to last and withstand the rigors of daily use. The cap is precision machined to fit perfectly and ensuring a tight and