hehehe yeah I know its not Opel but I went along with Gavin (CNBLU) to a Audi Dyno Day Dec 2011.
Have to say... one of the best organised dyno day's I have been to and the coffee was great :D
Just a few of the ones I really like...
http://i27.photobucket.com/albums/c1...ted900x600.jpg
http://i27.photobucket.com/albums/c1...ted900x600.jpg
http://i27.photobucket.com/albums/c1...ted900x600.jpg
http://i27.photobucket.com/albums/c1...ted900x600.jpg
http://i27.photobucket.com/albums/c1...ted900x600.jpg