I'm pretty sure if you were able to independently activate the intake and exhaust, you would have a smoother power curve and more hp/torque around 4500-4900 rpm. I would activate the intake around 4500 rpm and keep the exhaust at 4900.
The sr16 low cams are very small so that's why you are seeing such a big difference in power.
The sr16 low cams are very small so that's why you are seeing such a big difference in power.