Hi Terry, Thanks for looking!! I also sent the image to Carl at Aerotrader and he didin’t think it was B-25 related, he said the ducting I am making reference to is a flexi tube, it looks like it could be a solid tube on the illustration but then these IPC images aren’t that accurate, I will keep my eyes peeled, I am sure at some point I will stumble upon the answer. What ever it is it just looks a little too large to be from a single engine type?