1. The exhaust muffler kit replaces Honda GX390 exhaust muffler assembly and Honda GX340 exhaust muffler assembly. The kit includes Honda GX390 muffler, Honda GX340 muffler, GX390 exhaust pipe or manifold, muffler cover or muffler protector, GX390 exhaust deflector or GX340 muffler deflector, 5 nuts, 2 mounting studs, and 2 gaskets for muffler, as well as 1 pcs spark plug for the need of regular maintenance of your motor. 2. Replaces Honda GX340 muffler assembly, Honda GX390 muffler assembly, Honda GX420 muffler assembly. Part numbers include muffler 18310ZE2W61, 18310ZE2W62, muffler protector, muffler cover or muffler guard 18320ZE2W61, 18320ZE2W62, 18320ZE3W02, exhaust pipe or manifold 18330ZE2W00 / 18330ZH9N00. 3. This Honda GX 390 exhaust muffler with deflector fits Honda GX390 13hp engine, water pump, pressure washer, compressor and more application powered by Honda 390 GX 13 hp engine, including many 4400psi and 4200psi pressure washer, 37 ton log splitter and many more. It is excellent replacement for Honda 13hp muffler and Honda 11hp muffler. 4. Replaces Honda 13HP exhaust muffler and Honda 11hp exhaust muffler for Honda 390 engine and Honda 340 engine. 5. This 420cc exhaust muffler assembly with deflector also fits many other 338 cc 340 cc 389 cc 390cc 420 cc 439 cc Honda clone engines, including Harbor Freight Predator 420cc engine, Champion 389cc 420cc engine, Powerease 420cc engine, Rato 420cc engine, Loncin 389cc 420cc engine, Duromax 420cc engine, Dewalt 420cc engine, Simpson CRX420 engine, Genkins GK420E 420cc engine, Ducar 389cc engine, DH420 420cc engine and many more 11hp 13hp 15hp 16hp engine.