This megaphone is 18 inches in length and comes with the cookie cutter end pipe that made the Porsche factory team famous! It is designed to fit "European Racing Headers" 914.4 Headers. THis megaphone come with all applicable gaskets, nuts, bolts and washers needed. GT Racing also recommends buying the megaphone bracket assembly (GT Racing Part #914.4 BA). Ask us about Ceramic Coating Services!