Peter Schwarzenbauer, president of Porsche Cars North America, will give Detroit a fat middle finger over Lake Michigan later this week, when he shows up in Chicago to unveil the 2008 Porsche Cayenne GTS. Schwarzenbauer will host a breakfast before the public opening of the Chicago Auto Show this Thursday, where the fastest, hi-po Cayenne will make its US debut. Having sidestepped the Detroit show due to a mere trickle of sales there, Porsche can spend more time cozying up to one of its larger US markets โ€” the one in which Joel Goodsen accidentally rolled his dad's 928 into Belmont Harbor.