I saw 3 different Ferrari 512 BB LM's at Spa Classic 2015 and the Modena Trackdays 2015.
Numbers 16, 33 and at Spa Classic nr46.
The one at Spa Classic was much quieter then the ones at Modena Trackdays as it has silencers. But great sound nonetheless from the 5 liter flat 12!
Notice the modified Ferrari F512 M Testarossa at 1:48, almost as loud! And a more modern version of the flat 12, nice to compare the sound.

Ferrari build these cars for privateers to race in endurance racing. Not succesfully thought, the gearbox was unreliable. As the gearbox was the same as the road car, it couldn't handle the increased power of the flat 12.
During it's lifespan the power was increased further and the gearbox was build stronger, but it was too late.
Porsche came with the 935 (also in this video) with a twin turbo 6 cilinder boxer engine.
Producing up to 700 hp compared to 500 what the latest model 512 had which still was normally aspirated. Porsche was always a step ahead.

More info:
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Nice onboard at Spa:
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