The difference that I can see between a HyperPak and a Hurricane is in the way the center two ports exit the plenum. The HyperpaK two center runners go straight to the head, while the Hurricane center runners exit the END of the plenum and bend around, adding length in an attempt to equalize runner-length with the other four runners. Here's anothter couple of pictures: The top one is the long-runner manifold which came out several years ago; the bottom picture os of the new, short-runner manifold.
