ccreddell
I'm Awesome
I'll try to set some things straight here, even if no one is interested. It's true on most TBI trucks that flipping the air cleaner lid delivers gains you can feel. But there is a reason for it, and the reason it works so well is because most TBI air cleaners have the heat riser stuck closed. Whether the stove pipe is still there or not, 9 times out of 10, the flapper valve is always closed. I completely gutted mine, sealed up the hole and reinstalled it without the muffler and now I have the same airflow (or better) than a flipped lid, plus I'm getting cold air from the fender. The stock TBI can only flow so much through those 2 little holes and the stock air cleaner ducting to the fender can more than handle it. An open element has no advantage because you still can only flow the amount the throttle body can flow, and because you're sucking air from the engine compartment-even at speed the air coming in through the radiator is a hundred degrees higher than ambient. Hot air isn't as dense, so you flow less than if you get the air before the radiator heats it up.