Binghi,
Turbo Lance had a similar cooking problem on shut down. Cowl was modified with a top scoop to put more air over the dual mag in flight and let hot air out on the ground. For more cooling air to the oil cooler, an NACA scoop.
For better airflow past the turbo a grill which also let hot air out after shutdown. To complete the set a mini scoop and tube to cool the fuel flow transducer, several of which had cooked of and quit.
One mag fail was a baked nylon gear made brittle, fractured.
Had just commented on the ratty x strip..”wouldn’t want to land there” and a minute later I was on it.!