According to an article in the last edition of Auto Bild Sportscars (will scan it and upload it later when I have access to a scanner) there are some interesting new info (can't vouch for it's accuracy).
- The exhaust was co developed with Akrapovic (EDIT: On photos it can bee seen as being manufactured by Eberspächer, but the article mentioned developed not manufactured)
- The seating position is lower than in the E9x and where it should have been in that car
Passenger ride with Spengler:
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The engine feels more agile and lively than the S63.
Q:What is so special with this engine?
A: Above all it's response! No turbolag, no drop off in power, no drop off in power when changing up at high RPMs!
The sound at idle is a low burble, from 5500rpm a throaty and rumbling growl takes over - the Lion and the Bear in duet and with a symphony of a few hundred bumblebees in the background.
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Passenger ride with Biermann on the Autobahn:
Quote:
At exactly 100km/h in 7th, he accelerates with full throttle from just under 1800rpm.
From that rpm, the engine grabs deep into it's torque reserves and flings the car into a "step free" (ansatzlos) acceleration. The power rises as linear as a "silver rocket" (an analogy in German for a very linear increase in acceleration). Road conditions permitting, it takes you to the speed limiter in a smooth and calm manner (still talking about being in 7th). Absolutely superior!!!
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EDIT: Note all of this is passenger ride observations and that Auto Bild managed to persuade Biermann to take them for an extra ride on the Autobahn. The article portrays a enthusiastic and thrilling experience.