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About the only thing that might be in the $500.00 price range that'll let you do your own tuning would be from DeltaForce (formerly Sniper), although I couldn't say for certain. SCT offers custom tuning packages for the X3 but between the programmer and the software, you're looking at a fair chunk of change.
In general, you're probably going to be looking for just a basic programmer that supports custom tuning, such as the SCT XCal3 or the PHP Gryphon. With custom tunes, the prices are about the same. Each have their positives and negatives as far as hardware functionality, but the tunes would be fairly comparable.
Check the websites, see what grabs ya, and then come back with any questions and we'll see what we can do to help point you in the right direction.
I hope this helps.
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