No. Why do you want to? So your engine can run cooler? Thats all BS. Your engine is designed to run a certain temperature. I didnt even install the one that came with my URD kit. I personally dont think it makes a difference. If you really want one you can get a stant from your local auto parts store for about $20. TRD is evil :xdevil: and greedy.morenar said:Do any of you recommend changing out the stock thermostat to the TRD Thermostat? I have a 2002 Tacoma Dcab.