TOday was first day i noticed it, i changed from ams to a TES 4 inch core last night, and today i noticed my engine temp was lower then normal, under half mark, whne its normally a little above and sometimes it dropped to about 3/8 on the gauge, could thermostat be stuck open?

 

Evo temp needles normally sit just below horizontal. If its dropping down to 3/8 while driving though you may need a new thermostat. Are you running pump gas or E85?

 

pump gas it was always around horizontal until today it was under for some unknown reason

 

If it keeps dipping like that changing the thermostat with an OEM Mitsu unit would be a good place to start. You can also log your coolant temps to make sure they're sitting low and its not just the gauge sender acting funny. You should normally sit between 186-192F during cruise.

 

thanks for the input, because i highly doubt a bigger fmic would make the temp drop that much