Hum! Not too sure if this would be the aluminum hood. The hood has insulation under and it should not make any difference I think. My son just bought a new F150 with the same engine as his 2011 and this new Ford has a aluminum hood. The engine ( ecoboost ) is more quiet than his previous Ford with the same engine. I would blame the exhaust system instead.
Traverse 2017, chevy Uplander 2009 LT short wheelbase, Impala 2003, jeep cherokee Laredo 1990, chevy citation 1984 2.8 v6, vauxhall Firenza1972, rambler american 1964 model 330, vauxhall velox 1956 rebuilt, NSU Prinz 1961 2 cylinder micro car rebuilt, Renault Dauphine 1960 rebuilt, ford prefect 1952 ( english car with non hydrolic brakes rebuilt. Honda 1986 motorcycle in new condition and 13 travel trailers from a Boler 1300 to a Rockwood mini lite 20 feet.