ha-ha, that's good - the car will start to look like a storm-chaser
I got the pressure transducers as free samples from Freescale - can't beat that price. I've mounted two in a plastic "test tube". One of the transducers is connected for dynamic+static pressure for airspeed. The other, I blocked one of the ports so as to read static pressure only. Haven't tested these in a vehicle yet. I may have damaged one during soldering/handling - it gives odd readings
I have a GPS Shield with SD memory card - haven't worked on it in a few months due to work commitments, there was an issue running out of stack space while creating files on the card - it needs to be solved, or change the platform ... I have Atmega 328's but that won't solve the stack issue I think. Probably the Arduino Mega is what I should be using for this project.