I bought a Toyota Highlander last year and the Consumer Reports new car pricing service had information on the holdbacks for that vehicle. It also had information about the manufacturer and dealer incentives. This allowed me to bargain very effectively with the dealer.
Since Toyotas are high-volume vehicles, there is probably more information available about them than for a lower-volume vehicle like a Porsche. Still, it might be worth a try since the price of the service is not high. Here's a link: http://www.consumerreports.org/cro/customer-service/consumer-reports-advice-and-prices-on-buying-a-new-car.htm
Good luck.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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