Since there is no reason for someone to buy a manifold other than to replace one with a crack, why hasn't Ford figured out what makes the pi intake manifolds sell so fast? Obviously the pi's are selling mostly to npi owners for a power upgrade. So why don't they just make a pi for the npi engine?? It would just be a mold modification to match the npi heads. It could be so simple, but no, the last five years of manifold swapping hasn't sent any kind of message. Has anybody heard of a possible pi mani for the npi heads, or at least a custom adapting gasket set?