Plenum Volume

Lol! The 10 inch tall comment was a joke. The point was, for arguement's sake, a spacer with a 5x5 opening at 2" tall, you're gaining 50 cubic inches of volume (LxWxH=volume) times 2 is 100 cubic inches gained. That's all fine and good if the original volume is in the ballpark. Now again, I'm far from an expert and could be way off on this plenum volume thing, but I've read that the Indy is real small and if max benefit is to be had by matching the plenum volume to engine size, I'd like to be close. I could space the whole top plate up to gain more volume than throttle body spacers would provide.