Grumman AA-5 Traveler PFS New Tuned Short Stack Ceramic Exhaust System For O-320 Engine on Grumman Cheetah/Traveler with 150 hp and 160 hp Lycoming O-320 Engines and Lycoming O-360 Engines. (S/N 0-640) (Est. Install Time - 6-8 Hrs) (Up to 23.75 HP)