The other day I mentioned that our airbox has a flap that is controlled by the ECU. This flap opens up another entrance into the airbox where our airfilter lives. According to the Service manual, the flap stays closed on the regular cam. This means that air can only enter the airbox through the long runner that sucks air by the scoop behind the driver's door. Generally speaking, long runners encourage torque at lowish RPMs. On the High cam, the ECU allows the airbox flap to open up. This provides two passages for air to enter the airbox, the existing long runner plus the just opened very short runner on the underside of the air box. I ran the car with the flap open all the time at all revs. And with it running stock which means flap closed on the normal cam. Below is a quick comparo showing the g-force versus the road speed in 2nd gear going up an uphill highway on ramp. This follows the shape of the car's torque curve. G-force can be felt as that push in your back. Road speed is from the GPS and S/B accurate to about 0.1 MPH.
This was just a quickie test during lunch time with one run apiece. Looks like stock won, especially at low road speeds at under 3000 RPMs. There would also be part throttle benefits, but these were not measured. Above about 5800 the curves tracked each other as expected as this is in the high RPM range where the dual inlets would start to be used when the cam kicked in. It would not surprise me if the flap changed state at other times/loads/conditions.