You'll find just about everything you want to know about moving to Panama here:
Panama Guide - Thousands of Articles in English
I didn't re-check but if memory serves you can import a car and up to 10 grand in household goods, one time only, if you are moving to Panama under the pensionado program.
There is a Porsche dealership and club in Panama City. You'll need to brush up on your Spanish. When I went there even the receptionist spoke very little English.