To figure this out, first you need to know what model year you have. Next you need to know if you have an "S" model with the turbocharged engine, or non-S or "justa" model. "S" and JCW models can be easily identified by the hood scoop and badging.

Cooper (non-turbocharged) 2007 - 2010: N12
Cooper (non-turbocharged) 2011 - 2013: N16

Cooper S (turbocharged) 2007 - 2010: N14
Cooper S (turbocharged) 2011 - 2013: N18

Cooper JCW (turbocharged) 2007 - 3/2013: N14 (turbo, compression ratio, and other components differ from the S model)
Cooper JCW (turbocharged) 3/2013 and up: N18 (turbo, compression ratio, and other components differ from the S model)

The years above are model years, not calendar years, and the dates may be different for different models - R57 vs. R56, etc.

The best way to be sure is to consult the VIN decoder here:

https://www.northamericanmotoring.co...vindecoder.php
or
http://myminivin.com/

Then check www.realoem.com with your VIN and build date to help you understand your exact model and parts, some items (for example the HPFP) were changed after a certain date.

If you still have your original hood and engine/emission sticker, the engine designation is there under the hood as well. Information and photo credit to renchjeep.

https://cimg4.ibsrv.net/gimg/www.nor...4618c2d473.jpg

For more information, our vendors have some great articles:

https://www.pelicanparts.com/techart...nt_Systems.htm

https://new.minimania.com/MINI_Coope...son_N14_vs_N18

Incomplete link correction
 

Link is incomplete above..

Here it is again following search.

www.northamericanmotoring.com/forums/vindecoder.php







.

Easy way also to tell is the shape/design valve cover also :)

https://www.ecstuning.com/b-bremmen-...engine-covers/

https://c1552172.ssl.cf0.rackcdn.com/1669529_x800.jpg

https://c1552172.ssl.cf0.rackcdn.com/1669527_x800.jpg