These megaphones are 18 inches in length and come with plain end pipes and are designed to fit "European Racing Headers" 914.6 Headers. They are designed as a simple bolt-on. Megaphones come with all applicable gaskets, nuts, bolts and washers needed. Megaphones are sold in pairs only. GT Racing also recommends the Megaphone bracket assembly GT Racing Part #914.6-BA Ask us about Ceramic Coating Services!