best quality and looking car cover is available from MSroadrace on Ebay
here's the link, they are for 996 but fit all 911 Porsches well.
best fabric, like a parachute but better. slickest cover I've ever seen with the Porsche colors and logos. this cover can be used outdoors as its storm proof...at least it feels like it, very tight threading. I've had many types, this is by far the coolest toughest one.
http://cgi.ebay.com/ebaymotors/Porsche-911-996-Tequipment-Car-Cover-Genuine_W0QQcmdZViewItemQQ_trksidZp3911Q2ec0Q2em14 QQhashZitem4a9a86a373QQitemZ320420094835QQptZMotor sQ5fCarQ5fTruckQ5fPartsQ5fAccessories