If you have a tundra I believe the only chip that will work is the unichip and it piggybacks onto the engine behind the glove box. They certainly are not cheap I believe around 750 dollars so you have to decide if its worth it to your not.
Which tires do you think are best for the 2008 Tundra. Right now I just have stock tires but looking to upgrade to something better. Im wondering if the 285/45/22 will fit. Also can I go bigger than this? Whats your opinion on oversized tires and what brand etc to buy. 285/45/22