These megaphones are 18 inches in length and come with cookie cutter end pipes that made the Porsche factory team famous! They are designed to fit "European Racing Headers" 914.6 Headers as a bolt-on application. Megaphones come with all applicable gaskets, nuts, bolts and washers needed. Megaphones are sold in pairs only. GT Racing also recommends buying the megaphone bracket assembly (GT Racing Part #914.6 BA). Ask us about Ceramic Coating Services!