Significant anniversaries for Porsche and Penske this year have given racing fans a colorful glimpse back to its catalog of beloved liveries. Porsche and Penske announced on Tuesday that their 963 prototypes will be racing with a pair of throwback liveries at this weekend's Motul SportsCar Endurance Grand Prix at Road America. 6 963 will run the Sunoco livery that was worn by the Porsche 917/30 during the 1970s. 7 963 will race with a much more recent paint job, the DHL livery from the 2000s Porsche RS Spyder. The LMP2 dominated its class during the 2007 American Le Mans Series season, winning all but one race.