Several threads on this.. the box is a bigger restriction than simply running an open air filter.
Would running an open element and removing the pass side inside (high) beam light be a better solution ?I've had my KB ram air for many years. The intake noise is more quiet when using the canister. For the drag strip, remove the canister and just run an open filter for some extra power. The ram air does work, but it's really that efficient unless going pretty fast. The main benefit is getting cooler outside air into the engine rather that sucking all the hot underwood air into the intake.