This muffler is designed to bolt right up to European Racing Headers 914.4 exhaust headers and the stock mounting position on your 914.4. This muffler system dramatically reduces the sound emitted from your 914.4 over open exhaust systems. It is designed for the track person who drives their car on a race circuit that has strict sound limits. This muffler assembly comes with all applicable gaskets, nuts, bolts and washers needed. We offer Ceramic Coating Services (See website)!