I use two of these, one on each radiator input line. Do they help? Can't say for sure or how much, I have no hard temperature data to prove or disprove. What I can say is I have no, zero overheating or boilover issues in ANY terrain, and I run guards not louvers. Hard racing, slower going with my kids, tight NJ pines at a walking pace, or clawing up a rock covered mountain trail is all good. I think that they must help, and there is no downside, so I will move them over to the '12 and ditch the thermostat.
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