the_hump,

I'm guessing here but that looks like the work of the now defunct PSI Motorsport. They were based out of Thimister-Clermont in Belgium.

http://www.psi-motorsport.com/porschetuning/index.php

I have pix in my hard drive of a few PSI Motorsport cars. If you want to see them, let me know and I can dig them up.

Regards.

 

A few PSI cars.

 

Excellence article.