world model dago red with rossi 53
We use to race the .40 sized World Mustangs locally. We started of, with just the OS. .46fx and were getting speeds between 90-95 mph. Since then, I have seen them fly on Piped .60s at about 120 mph, and non-piped .60s from 105-110 mph.
I would estimate your speed somewhere around 110-115 mph with the piped Rossi.