My buddy works at a stereo shop, and they had a Carrera GT in to do an XM radio install. The boss told him "DO NOT drill into the gas tank (happens every now and then), the dealer said they bill 100 hours to replace the gas tank, since the car has to be split in two to get to it."
I dunno if it was a scare tactic or not.
Champion Porsche $100/hour shop rate X 100 hours + gas tank =