For a DD, an OTS tune may be good enough. But they are one-size-fits-all, so, to get maximum benefit, you need a dyno (or remote) tune (as mentioned above, every drivetrain is slightly different). Is the few HP worth the money to you?
Personally, I'd go ahead and spend the "extra" $200 - if one is going to do it, one might as well do it right.
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