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He is willing to upgrade to ATT + Bill tune, but thinks it is better first to install a fresh engine.
The one in the truck works fine, but it has more than 330 000 kilometers.
That's a little over 200,000 miles... I would go ahead and upgrade the existing engine, the upgrades could be moved to
the new engine, IF this one does go out. If there are no issues now, you could easily get another 100,000 miles out of it.
Just my opinion, I wouldn't fix something that is not broken.