I feel like we post this over and over....DON'T buy Mishimoto crap. MY tuner has a pile of their failed products over in a corner.
I have a complete monitoring system of gauges. I swapped to the 2008 G37 thermostat Chuck refered to and it works great. It was over 90's in the shop last week during my tune and we never saw coolant temperatures over 200defF.
I highly recommend the radiator upgrade. I'm running the CSF and it works great.
Your oil cooler is too small for Houston weather. I'm running a 30 row oil cooler and have an additional grill since I own a G. Driving around this weekend with temperatures in the high 80's/low 90's it's nothing for you to have 220deg oil temps while boosting. Now you're might be lower since I believe the Stillen SC is a self contained oiling system but it'll still get pretty high.
Chuck hit is on the head...Go overboard with heat management!
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