With the baffles out they measured 143db with the throttle held at 4500 rpm with a static noise meter, last year at a track day at Donington Park
The ground rumbles when the throttle's blipped, and there's a hefty pressure wave if stood behind it, sounds feckin gorgeous especially on the overrun. Nothing sounds sweeter echoing around the hills of the Peak District than an SP on full chat( bar a Rolls Royce Merlin).
Usually run with the baffles in as half of Derbyshire knows I'm coming if they are out
Will try and get a vid up if I figure out how to do it.
If you disagree with my opinion, feel free to ignore it.