HPI Replacement Muffler Set for HPI Nitro Vehicles. This is the Silver canister that bolts directly to the crankcase.

Constructed of cast aluminum. This product includes one rear muffler half. One front muffler half. One center baffle. Two center gaskets. One exhaust gasket. One 3 x 54mm half-threaded muffler assembly screw One 3 x 29mm round head machine screws

This is a single unit, and does not require a header or manifold.