In stock form though the A14 and A15 have almost the same quote horsepower, which I assume is because the A14 can rev higher (otherwise it wouldn't have the some hp as an A15)

I see what your saying about "no replacement for displacement" but hp=torque x rpm...so both torque and rpm are important to a circuit car engine.

Does anyone have a torque + hp curve versus RPM for both the A14 and A15, that will show us all the characterisitcs of both motors.