I have no idea about the tire pressure code. I have not heard anything about that. I also would recommend calling Volant. They may be able to give you answers. When you get a Predator, I can walk you through the tuning process. I got mine from Thourobred Diesel for 300 dollars and got the usb interface fore another 40 dollars shipped. You might even find an online coupon for the site. With the Predator, you will not be disappointed. At least I saw a decent difference.
How does she ride with your CAI? I highly recommend getting a diablosprt predator or a tune. Power and gas mileage will increase a bit. You are probably running a little(not damaging) lean. Once you get the Fuel Trims lined up, its even a better CAI.