And Zurich. One thing to remember - the markup on an extended warranty is usually 100%. If the dealer is offering it to you for $6,000 (hard to say if that's reasonable since you gave no details at all on what you're buying for that money) the warranty will cost the dealership $3,000 to place with the warranty company. Extended warranties are a big profit center for the dealers who sell them.
You can frequently shop a warranty around - non Porsche dealers can sell warranties on a Porsche, so get some competition going. Just make sure it's apples to apples - same company same policy.