Need a little more help here. An aftermarket dealer told me to just add CAI and cat-back exhaust and NOT computer programming mods if I wanted more gas mileage. Hmmmm. He said the CAI and exhaust has shown improvements in both gas mileage and some performance but that the computer programming really only helps with performance and can actually reduce gas mileage. Is this true?
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\'05 H2 SUV, LUX, Stealth Gray
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