Well I guess I will once again go against popular opinion when I say I rarely let'er cool down. Now if I had just been running at high speed down the Interstate and pulled into a rest area than I may allow for a cool down but that would depend on how long I took to find a parking spot.
Pulling into most parking areas is done at a relatively low speed, 5 to 10 MPH. At this speed the turbo is already cooling down and so I feel there is no need to sit there even for another minute.
Glenn
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