The 2016 model year (the '5th facelift') introduced the twin-turbo 4.0-liter M176 V8 rated around 416 hp and 450 lb-ft, replacing the naturally-aspirated engines. It is the first turbo G550, notable for an exposed aluminum intake manifold with no central engine cover, and some owners find the stock car underpowered enough to seek Brabus tunes, while others in the community flag unspecified 'issues' with the biturbo cars versus the NA V8.
2016+ M176 4.0 biturbo V8: new engine, underpowered complaints
Mercedes-Benz G-Class (W463 1990-2018) · mechanical