Matt Prior pitches the 503bhp Mercedes-AMG GT S against its biggest rival, Porsche's 911 GTS
Video: New Mercedes AMG GT S Vs Porsche 911 GTS Head-To-Head
Matt Prior has the keys to the new Mercedes-AMG GT S, the 503bhp creation from Mercedes' performance arm. Is it good enough to topple the Porsche 911 GTS?
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