CSF is a solid choice, a few issues from some owners but CSF has tried to patch them up and help owners out.
On the thermostat end there is only 1 choice, the stock one is very good and the only true upgrade for a street car is the OEM 2008 g37 one. Between a CSF radiator and lower the fan kick on temp you will do a very good job. You can also look at upgrading the fans & shroud but only one option with that right now if you want plug n play other wise you have to order the fans & wire it yourself while also building a shroud to fit.
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