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Better timing chain design, more capable HPDI furl pump and injectors, has a MAP sensor where the LLT did not so easier to tune and will run if MAF fails where LLT leaves you stuck, and if she gets a 2014 or newer the PCV drill mod is not needed as GM adopted the design the RX guy's had shared with all, and the 2014 and up have a low oil level indicator so if your/she is not one to check oil every 1000 miles or so that may save her from a blown engine.
I would shy from a LLT for those reasons.
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