I intend to replace my coils and was told the 2K1 coils are of a "better" reliability compared to the 2K ones (I really didn't understand what this "better" meant in the first place).

Anyway, can we put 2K1 coils into a 2K car -- more interested to know if they fit in the first place?

Any suggestions....

 

Same engine, same coils.
New ones were updated by Nissan to last longer.

 

Right!!! same size, but the difference is a white line on it!!! Its supposed to be upgraded 2y1, so far not problems with them...