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My car makes more power at 160-165 than it does at 180-185. I went to a 160 stat, and gained a consistant 1-1.5 MPH at the track. So I'm going to rely on that evidence. As far as wear....... makes sense for a daily driver, my car sees about 1000 miles a year, I'm not too worried about it.

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Same here. I run a 160 and the engine NEVER goes above 170 even on 90*+ days. I DO NOT have a daily driver and my car doesn't see more than 1000 miles a year also. If it works , don't fix it!