[Daves 14 crosstrek]

Not a definitive answer, but a quick search for an engine on the Car-Part.com site for a 2014 (using my 2014 VIN) only returns 2012 to 2014 Crosstrek's and Impresa's. A transmission and an ECU search just returns 2014's.
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You are right. Now I have to find an older motor and have a 2017 motor to sell

 

[Daves 14 crosstrek]

Sorry Dave, I'm no help with your question but I know the 6 speed manual transmission swaps to a 2015 from another person's post.

I'm very curious as I'm sure many others would be, what's wrong with your engine and what's the milage you've got on it?

Under cruise control at 75, I started climbing a steep hill which caused a down shift. A just under 6k on the tac and sudden engine clatter right and left side.