This XFR-S mule was caught testing at Jaguar
's facility by the Nurburgring
. Even though we see plenty of XFRs running around the facility, this one was testing with the XKR-S convertible prototype and made a significantly louder noise than any of the standard XFRs. The mule is missing several features on the exterior that the XFR-S will carry, however it does sport the XKR-S' blacked-out wheels which could make their way to the XFR-S.