The factory air duct is sized for WOT for passing power.
If you're cruising with your TPS between 15% and 20% then the actual cross section area of the air tube you need is very small. Unless you need to make full power at WOT, then you do not have a problem there with size.
I've always ran my WAI to the exhaust manifold , to either the factory heat-stove or one that I made. After a few minutes of driving typical temps for the WAI are between 120*F and 160*F for mine.
What are those numbers you posted exactly?
IMO the best set up is using a cockpit controlled diverter valve to switch between WAI and CAI.
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