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Yesterday we brought you news of the track-only McLaren-Mercedes SLR 722 GT, with even less weight and even more power.  

Imagine what it sounds like, we said, with its racing exhaust piping 671bhp of V8-flavoured fury into the open air.

Well, imagine no more.

Sure, it's only burbling gently around the Paul Ricard circuit, but just listen to that noise. We might just have figured out why it's not road-legal.

Now think what a whole gridful of 722 GTs would sound like on race day. Pass the earmuffs...