Just asking a question on this topic as I'm trying to learn. If the inlet tube is warm from under hood temperatures, what temperature difference would there be by just placing the filter outside of the engine compartment? I've heard that it helps to improve performance, so I thought that if the inlet tube was insulated
So you want to drill a huge hole in your hood and have an air filter jutting out of it? Common sense would expect a more thought-out question rather than a general one. I'm thinking car application but have no idea what vehicle you have in mind.