I have a Hypertech programmer. You can get them for $315 brand new on eBay.
I mainly got it to change the speedometer for larger tires and didn't change the shift points. I've only had it for a week, too, so I can't tell much mileage difference. And, I put it on with a K&N FIPK and Magnaflow cat-back. With all three, I do notice a change in performance. It's hard to say what is from what, though.
The larger tire change worked great, though.
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