I would go with the hypertech max energy. I got one and can't believe how much of a difference it made in power and gas milage. I think you will see more of a benefit from the programmer than the exhaust.
Yea a lot of places will pull the codes for you. Or you could buy a code reader. I bought one a few years ago for $100 and it has been extremely handy being able to pull codes/erase codes and turn off the CEL.
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