Meet McLaren’s deadliest track day motor, the 720S GT3X. This very car won the Goodwood Hill shootout at the Festival of Speed earlier in the summer. Beat everything. So the GT3X is clearly very, very fast indeed.
 
But what’s the point in a 750bhp no limits GT3 racer that can’t race? Well, Top Gear Magazine’s Ollie Marriage strapped himself in to find out. Then we strapped Stig in to see how fast it really is.

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