Snouty body and seriously beefed-up powertrain make A45 S a match for the Nissan
 
            
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The insane Mercedes-AMG A45 S comes in at £50k. Does it make sense to spend that much money when you could instead buy a lightly used Nissan GT-R? 
          
       
  AMG A45 S vs Nissan GT-R: New hot hatch vs used supercar