The RLV5021-224 is used for top end power in stock to mild-modified builds. This pipe utilizes the thin flange and comes with a brace. It accepts the 1 5/16" muffler. This pipe fits clone engines, the Ducar 196, 212, and 224 engines, and the Harbor Freight Predator 212 and 224 engines.This pipe has an I.D. of .932" and a length of 19 1/4".