Factory Sport Muffler pics on German cars...?

Preparing my technical inspection at the German TUEV in advance...(to get my car licensed and street legal here - and to get a Historical Vehicle Plate)
I am looking for pictures out of old magazines or books, showing cars (licensed in Germany!!!) using the factory sport muffler with the straight pipes, just like my car...
Does anybody have pics of cars other than the (1969 - ) rallye cars with Stuttgart plates...,
I need something more 'civil' and 'laid back' to convince those guys, that I am not the first guy messing with any written down noise regulation in Germany...

; )))

May be worth a try!
Keep your fingers crossed!
THANKS!