I live in CO as well and I believe the NADA pricing is more in line. KBB IMO isn’t the best source and few car dealerships use KBB in their pricing. I always look at car gurus median asking, look at KBB then NADA and come up with an overall mean for the condition etc. I am in CO as well and convertible sports cars take a hit in value for desirability given our winter driving conditions.
Regarding what to do with the car, personally I would fix at least your known problem, and as mentioned, @ 115k your motor mount is definitely toast as well. Given so many potential cars out there, a Boxster with “issues” will most likely be hard to sell unfortunately.
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