I stumbled across a great deal on a 4th Gen at CarMax for what that's worth (or so I think, it's being shipped now).
It was $10k less than anything similar that I could find elsewhere.
My wife has an ECO Diesel Jeep, and a tune transformed it.
Added 3+mpg and made it massively more responsive.
The exhaust brake is also a game changer in the mountains.
Her is fully intact and tuned for 50k miles with no issues.
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