Insta-Boost belt treatment reduces slippage on serpentine belt driven superchargers. This stuff is almost too good to be true. For a few bucks you get a 4 oz. bottle that will probably last over a year. One application can last up to a month or more! If you cant get more boost after applying this belt treatment you have your belt way too tight. Beware of this. We have seen main bearing damage, blower bearing damage and broken crankshafts due to excessive belt tension. With Insta-Boost you can have the increased boost and increased HP without the bad side effects of a tight belt.