[KevinH1990]

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.