Removed the out drive today to check the gimble bearing and lube the u joints and found this. I am a mechanic by trade but know nothing about boats. I an assuming it is some type of baffle to stop water from returning from the exhaust. No idea where they came from or if there is suppose to be a hinge pin connecting them. Boat is fairly new to me its a 1998 Bayliner 1950 3.0 alpha 1 gen 2.Any and all help id greatly appreciated