This adapter easily allows the user to switch from megaphones to the stock exhaust system. The Muffler adapters fit from the header flange to the stock muffler flange. Fits all "European Racing Headers" 914.6 header systems. Muffler Adapters come with all gaskets, nuts, bolts and washers needed. Sold in pairs only. Ask us about Ceramic Coating Services! Weight 4LBS