If you are going up Pas De la Casa it will take forever and your engine will really lose power at 9000 feet. And dont forget to stock up on duty free in the bazaars. I have happy memories from 2003 of having the fastest car on the mountain and following the local trick of looking up the hairpin bends counting the cars and trucks and then overtaking people by going blind round the outside of the hairpins on the left hand side of the road. My car ? A 1990 70HP Peugeot 309 diesel turbo, driven with the wastegate open all the time. Loads of revs, max boost. I was passing petrol cars looking like they were rolling coal as they were running too rich.