some good advice above.
one thing i did not see mentioned is you should NEVER try to mix and match tunes. bad things can happen.
i noticed you had a diesel in your sig. diesel tunes vs gas tunes are a bit different.
on diesel, they usually advance the timing and increase injection pressures to get better mileage and better power. If you do too much, BAD THINGS happen. again, do not mix and match - buy from a known reputable source.
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