Interesting screenshot from the McLaren "720 engine" video, this is the sport exhaust on the engine dyno, is that with or without the valves ? 


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And the valved non sport version


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997 GT2 2014 3.9 Mezger, 800PS @ 1.2 bar

2018 McLaren 720S 

993 Turbo, 2006 built 3.8, 577PS/797NM, 1440kg DIN sold to a worthy enthusiast.