I'll get pics of our P-38J around the tubos on Saturday and get back to you in here.
Though we don;t use the turbos, they are bone stock externally with the exception that the turbo fresh air intake is plugged. We get carburetor air through the center opening in the cowling today. The two outer openings are oil cooler air ducts.
I won't be able to get P-38F shots until Galcier Girl visits Chino at the end of April for our annual airshow.