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It might share the GT nameplate with what we think is Merc's finest sportscar ever, but the new AMG GT4 is a substantially different animal.
And while it shares the same 4.0-litre, biturbo engine as the GT R, the mad scientists at AMG decided that their new "4-door coupe" (*cough* sedan *cough*) needed even more power. And so this super saloon boasts 470kW and 900Nm of torque, a full 40kW and 200Nm more than the sportscar.
Granted, the saloon is heavier, but how would all of this translate in the real world, and out on the incredible Circuit of the Americas race circuit?
We sent Cars.co.za's Ross McIlroy to Texas to find out.
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