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Most of the blow-through setups are built with these annular boosters, which have been proven to move a lot of air. The signal is good, and responds well to jet changes. For lower-horsepower applications in the neighborhood of 450 hp, The Carb Shop uses dogleg boosters in the primary with the annulars in the secondary. For 700-plus-horsepower applications, they use nothing but the annulars.