I would get at least a 180 degree thermostat. I also would find a sleeve type and not use the cheap poppet type. It's gonna cost a couple dollars more for the sleeve type but they are more accurate and actually will flow more coolant when needed. I've had a few come back with no heat problems when on the highway, and they were always the poppet type that I got at the local NAPA. You need to ask for the high performance or heavy duty style. Also ask the guy behind the counter if he knows the difference! If he doesn't I'd think about shopping somewhere else. I don't like having unhappy customers!