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is the earlier spool up of the turbos, about 500 RPM sooner. This puts a greater area under your power curve, although I haven't Searched for any dyno sheets that just show before and after downpipes. Most folks quote a 10-15 HP gain. There's tons in Search. When you hold your old, clunky precats in your hands, next to some nice, smooth split down pipes, it's not hard to believe.
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