The P115 was a significant refinement of the P83 it replaced, with the most obvious differences being a squarer appearance and the external cooling pipes seen on the P83 being moved within the chassis for better aerodynamics.
Only one example was built[REF] and it was entered in the last 5 Grands Prix of 1967 in the hands of Jackie Stewart, with Mike Spence driving the car in the first race of 1968.