Dyno testing

EM has done other parasitic loss videos.
Alternator: not much.
Fuel pump: not measurable.
Air cleaner: depends a LOT on which filter housing and element. Test of 19 aircleaners showed everything from 100 hp loss, to 5 hp gain (velocity stack actually made power) The great majority of quality a/c setups, horsepower loss on a 700hp engine was negligible. Flow DOWN into the carb was better than airflow across it.
Water pump: less than a bad fan.
Exhaust.: again, depends a LOT on motor power, size, mufflers, pipes et all.
Just did a test of a 598 Chevy for cutouts. The mufflered exhaust they used robbed the motor of 50 hp, and more than 80 lbs torque. (Imo, they did it on purpose to make the cutouts look good)
Yet they did a test of 4" race mufflers on frieburgers blown 1100 hp 555 cu in big block, and they cost less than ten hp.
In my humble opinion, the wrong fan will cost more hp than the right exhaust.