These megaphones are 24" in length and come with cookie cutter end pipes and a shroud for heat resistance for the bottom of your Porsche bumper. They are designed to fit "European Racing Headers" 911 Headers. Megaphones come with all applicable gaskets, nuts, bolts and washers needed. Megaphones are sold in pairs only. Bexco Automotive also recommends buying the megaphone bracket assembly (Bexco Automotive Part #911-BA). Ask us about Ceramic Coating Services!