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You'll have to install a smaller upper or just suffer the loss of boost. At Magnuson we'd sell a blower for a Jeep that was supposed to put out 6 lbs of boost at sea level and they lived in Denver so the customer would have to install a 5mm smaller pulley to make bring the boost back to 6 psi. Usually 5mm is about 1.5 to 2 psi either way you go up or down.
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