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About 7 minutes for the actual tune load, about 10 minutes over all. Be sure to turn of automatic headlights and the air handling system. Don't open the door or operate windows during the process. Don't worry about the tuner discovering a code as it is a product of the connection. I am on a month long tow trip and am using the 89 tow tune, but tried the 91 tow tune for a shorter trip and it was astounding. It just makes me nervous to go that aggressive while towing.
 
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