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If you decide to go with a 2018, would definitely recommend a katech oil pump. Mine has a build date of 05/2018 and pump failed at around 12k miles. Motor needs to be pulled, or that's the best way to go about it. If you're gonna have the oil pump swapped, pay the extra money for a cam and other valvetrain upgrades. Ported heads aren't necessary but worth maybe an additional 25hp. Not as big a deal on boosted motors but the engine will run more efficiently with them. Paid around
$9k between all the upgrades that went along with the oil pump and labor. Good luck, and if you have any questions feel free to shoot me a PM. I would base your decision off whether you want a pre, or post refresh zl1. If you really want a pre 2019, then definitely factor in the cost of oil pump replacement as well as whatever upgrades your heart may desire.
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