HVH Super Sucker on the way

I use spacers all the time, but I really only use open ones, to make a small plenum bigger. IMO, a dual plane with a spacer of any kind is the wrong intake choice. I'd rather run a smaller port single plane (like a street dominator vs an M1) and make the plenum larger, than use a dual plane with a spacer. If the intended usage takes it full throttle over 5000 on a regular basis, a single plane may make more power in the used rpm ranges. It's just an opinion tho.