'74 air cleaner - before and after

Hood insulation (unless this is a trailer queen) serves and important purpose: to capture all the dirt that makes its way into your engine compartment and then evenly distribute it onto your engine and onto everything else under your hood over time, until it is ripped off and shoved in a trash can. This usually happens after slamming the hood over your meticulously cleaned engine compartment the night before a show and then opening the hood again (looking for the rag you left in there) to discover everything coated with a thin layer of dirt...