sentences:  In the early 1920s Vittorio Jano received a commission to create a lightweight, high performance vehicle to replace the Giuseppe Merosi designed RL and RM models.The car was introduced in April 1925 at the Salone dell' Automobile di Milano as the 6C 1500.It was based on the P2 racing car, using a single overhead cam 1,487 cc in-line six-cylinder engine, producing 44 horsepower.