For me it's actually one of the cars from my work. Two or some years ago they were already headliners on this site but the sound still gives me goosebumps.
My boss is responsible for the engine. Previous years, due to regulations, we managed to achieve 500,4HP from the S54 stroker engine. Transmitted through a Hewland gearbox.
I remember it very well. Last year we had a test day at Zolder in Belgium. We were the first to go out on track, it was a bit damp and cold morning. You could hear the car going through every single corner and gear, for the complete lap.
Also want to share our new car, an F80 M3 based endurance car, with the S55.