I've seen two that were test mules driving around Jersey. One on the highway and another one parked in Hoboken for a while. I can't say with 100% certainty they were the 50D but they were definitely new engines in the F15 body. Ill see if my girlfriend still has the pictures of the one on the highway. You could see it was partially camouflaged and had tons of computer equipment all over the dash.
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