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Why don't you re-install the factory tune, then check your 0-60 time......then compare it to the factory specs. Then, put the Diablo performance tune back in and check the 0-60 time.
If you're not getting anywhere near the 0-60 time that the factory says you would get, then you have a problem. Otherwise, you either need to go to a 4.10 or 4.56 rear end or add a supercharger if you really want that much more performance.
Good luck.
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