Nice work... What goes in gotta go out... Have you thought about that? I increased the airflow over my center radiator by changing the bumper to a 997 GT2 bumper which has vents on the top of the bumper. I believe I'm moving more air now across the radiator. Before the radiator was tight to the trunk bulkhead and no where for the incoming air to go. I tipped the radiator forward so the air hopefully now passes through the raditor and out the vents. I appreciate my solution won't be the same as yours since the model difference.