That seems like a LOT of radiator surface area you’re blocking.
I've been curious of the same thing with a lot fo the bumpers on the market that seem to take away all the airflow to the radiator. A lot of bumpers have no holes at all. How do these 4runners not overheat?
since it is a new product not many reviews yet, but more will be coming out alone we have installed about 20+ plus at the shop and haven't had any complaints.