Solved: Allemano's № 526 - Audi 100S Coupé test mule for the Porsche 928

[Allemano]

You should be able to identify the original make and model designation of this car, but that's not the point.  
What's so special about it? Tell us the story!
One point for the right and complete answer!

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[Allemano]

moved to experts

[Aaron65]

Is this the Audi 100S coupe prototype that Audi/Porsche used to develop the Porsche 928 V8 engine?

[Allemano]

you guessed it!

[Wendax]

Bad news: this car has been destroyed on January 20, 2011, when a fire in Bönningstedt near Hamburg burnt down the garage where most of the Raffay collection has been stored. Probably 65 of the 75 cars in the collection were destroyed, most of them related to Ferdinand Porsche. In the collection were a Lohner-Porsche, several Austro-Daimlers, Mercedes-Benz S/SS/SSK, a VW 39 pre-series car, a 1950 Gmünd Porsche 356, the London-Sydney-Marathon Porsche 911 and many more Porsche. I remember having seen a Woods Dual Power, a Tatra 97 and a Peugeot from before 1900 been shown from that collection. Below you can see the Lohner-Porsche before and after destruction.

[Allemano]

That's bitter!

[Carnut]

Did read about the fire.
There was a suggestion it was arson, perhaps by some bitter former employee taking revenge..
Life imprisonment would be too good for him if it's true!

[Wendax]

Yes, the fire started at the neighboring gokart track, probably arson. I saw the smoke cloud from where I work. I didn't know what jewels it was fed by then.

[Carnut]

Yes, the fire started at the neighboring gokart track, probably arson. I saw the smoke cloud from where I work. I didn't know what jewels it was fed by then.

Sie sind Hamburger?!

[Wendax]

I work in Hamburg, but I don't live there.

[DeAutogids]

Yes, the fire started at the neighboring gokart track, probably arson. I saw the smoke cloud from where I work. I didn't know what jewels it was fed by then.

Sie sind Hamburger?!

You will find Hamburgers at McDonalds.

[Wendax]

You will find Hamburgers at McDonalds.

Only the fat ones 

[Carnut]

I work in Hamburg, but I don't live there.

You work?
How on earth do you find the time to do that?!

[Wendax]

Multi-tasking 

[DeAutogids]

I work in Hamburg, but I don't live there.

You work?
How on earth do you find the time to do that?!

I think his day has 48 hrs.

[Wendax]

I think his day has 48 hrs.

And if that's not enough, there still is the night.