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The difference between 2017 and 2018 on what comes standard in the Stingray model are now the 19/20" wheels; a better back-up camera and the HD radio. The 19/20" wheel sizes were part of the Z-51 package
19/20s were also an option on 2015 and beyond base cars, but yes, now standard in 18.
In 17 the MSRC option (non Z-51) forced you into 19/20" tires and the rear spoiler. For 18 that is now unbundled so that MSRC is a separate option. Since you will already have 19/20' standard this just means you aren't forced to add a spoiler. Effectively, the price of MSRC went down a bit.
In addition, the 2018 2LT now includes the 3LT seat color upper dash pad without what I think is the 3LT "patch work quilt" look on the dash and too much color on the doors (at least with red.)
IMO a better choice.
I added the GM part to my 2017 2LT Grand Sport. Takes ~10 minutes and cost ~$320.
This is a pic:
Seat color 3LT Upper Dash Pad added to my 2017 2LT Grand Sport.
Difference between 2017 and 2018
