I was looking at my 84 300D engine and realized that the air cleaner really puts a lot of twists and turns in the flow path for the air coming in. I was thinking about streamlining this flow with an aftermarket air cleaner/intake piping. Has anyone else done this, or can recommend this for increased fuel mileage and/or power from their engine?
Additionally, the engine has 263k miles on it, does that make a difference?