... dirty stinkin' Cessnas... except the 172 I'm getting hours in. It can cruise at 120.
Anywho... you can use an intercooler in the cowl to cool the intake airflow. Heat is relative... Atlanta is not so hot after living in Houston. A warm room can still cool you down after a hot shower. The heat in the cowl is not as hot as the heat from the exhaust, so the air in the cowl can still cool the intake through the heat diffuser of an inter-cooler even if it feels relatively hot to us.
Airflow from the NACAMCDBA duct does its part to add a cooling air flow into the cowl. If that is not acceptable... you can pop in a few armpit scoops, mount the ic's, and hope you generate more thrust with the drop in intake temperature than drag with the airodynamic change.
If you follow John Slade's site, check out the progress of Greg Richter's turbo rotary. He went from obscenely large scoops to oil, radiator, and intercoolers suspended in the cowl away from the engine block. I wish I had the sense to have photographed his engine when I went up to visit him before he swapped in the turbine!