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honestly I installed it, diconnected the battery for 15-30 minutes, reconnected the battery and started the car. Let the car idle for about 15-20 minutes while I was cleaning it, shut the car down and went to bed. The next morning I drove it to school, and WOW, there was a def improvement in responsiveness, and low end power. This mod is worth every penny of the $250 NEW price...I am very happy with it!