Quote:
Originally Posted by jml
One cut-out actuator failed this weekend at the track. It was 105 degrees, and I was running about 5mpg (hot exhaust), it probably cooked. Glad they have a lifetime warranty 
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The heat into the valve is much more related to how hard you drive rather than the external temperature. Thus I am thinking the valves, in the location you used are going to get too hot under track use. Do keep us posted on your replacement schedule.