A quick observation (air intake location)
I was recently looking at the nissan micras engine bay while at the dealership, and I couldnt happen to smile when i noticed that the air intake happens to sweep down under the engine and behind the light. CAI kinda, though you could probably get much better airflow with something other than that plastic junk.
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View my fuel log 2015 Micra S manual: 6.5 L/100 km ... 43.7 mpg (Imp) ... 15.5 km/L ... 36.4 mpg (US) ...