About the only things that a Porsche and a VW have in
common are
 ancestors that were designed by engineering teams led by the same
 individual.  By that metric I've got a pen that's a cheap
 {Porsche, VW}. Or is the assertion that all four wheel vehicles
 with boxer motors Porsches (in which case Subaru is in for a surprise ;-))? 
The engines in the VW 411, the early 70's VW type 2 (bus,pickup), and the
original Porsche 914, ...
are more similar than PC-DOS and MS-DOS.
BTW, when marketing parts for those engines,  would it be better to call
those parts "for Porsche" or "for VW"?
--
Grumpy Ol' Fred        cisin(a)xenosoft.com