However, this came at a price.
To add Porsches added 50% to the price of Forza 4.
Unlike other DLC cars, online players who did not cough up the extra $30 could only see competing Porsches as black VW sedans.
And, surprise, surprise, since the Porsches not only look like a VW, they have the physical dimensions of a VW which screws up collision detection. The Porsche driver's Xbox and the other drivers' Xboxes have quite different ideas about whether a collision occurred when cars get close. It's possible, when driving the little Porsche 550 Spyder, to cleanly pass your online friend who then goes spinning off the track because he/she got hit by a VW sedan.
Finally, in a triple screen Forza 4 setup, if you only buy the $30 DLC for the center Xbox 360, you get to have VW sedan doors on the side screens with Porsche cockpit on the center screen. There is a time consuming workaround which must be gone through with every startup of the system, but the operationally clean solution is a $90 add-on.
