General  Engine / Induction / Exhaust  Suspension / Tires / Brakes  Transmission / Drivetrain / Rear End  What temperature is the stock thermostat and can I go lower?   Stock on the 4th generation cars is a 180 degree thermostat. This should be good enough for any but the most seriously modified car. Although, you can go down to 170 or even 160. Hypertech sells a 160 which is supposed to be combined with their performance chips/programmers. And contrary to some opinions, the vehicle will not drop out of closed loop with 160 degree thermostat since that depends primarily on O2 sensor temperature, not engine temperature.
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