BiTurbo:
Porsche nowadays doesn't care about old customers, all they want is for you to pay up and shut up which will push me to look into other brands in the future, such as Lamborghini which has been giving me big discounts which Porsche failed to do so on my last 3 special order cars.
Big discounts? Well, it depends on the market. In Germany, people can expect up to 11% for a 991 at their local dealer, the same for a Cayenne GTS or Turbo (not that much for a Diesel/S) and the Panamera fuel operated models.
For the 991 Turbo S, I have figures between 5-7% but it really depends on the dealer.
More? Well...there are independent dealers who may offer more but I want to support the local Porsche dealership because when I have issues with the car, it is him I expect to fix.
I don't know about the rebates in other countries but it really depends on the market and the specific model.
This isn't always Porsche's fault (well, maybe a little bit since they seem to offer less incentives to dealers), there are also many dealers who don't want to give a rebate out of principle. Especially if they have more customers than available cars.
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RC (Germany) - Rennteam Editor Porsche Panamera Turbo S, Cayenne GTS (958), BMW X3 35d (2012), Mini Cooper S Countryman All4