- This exhaust muffler kit replaces Honda GX390 and GX340 exhaust muffler assemblies. It includes a Honda GX390 muffler, a Honda GX340 muffler, a GX390 exhaust pipe or manifold, a muffler cover or muffler protector, a GX390 exhaust deflector or GX340 muffler deflector, 5 nuts, 2 mounting studs, 2 gaskets for the muffler, and 1 spark plug for regular maintenance. - Replaces Honda GX340 muffler assembly, Honda GX390 muffler assembly, and 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. - This Honda GX390 exhaust muffler with deflector fits Honda GX390 13hp engine, water pump, pressure washer, compressor and more, powered by the Honda 390 GX 13 hp engine, including many 4400psi and 4200psi pressure washers, 37 ton log splitter and many more. It is an excellent replacement for Honda 13hp muffler and Honda 11hp muffler. - Replaces Honda 13HP exhaust muffler and Honda 11hp exhaust muffler for Honda 390 engine and Honda 340 engine. - This 420cc exhaust muffler assembly with deflector also fits many other engines: 338cc, 340cc, 389cc, 390cc, 420cc, 439cc 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 420cc engine, DH420 420cc engine and many more 11hp, 13hp, 15hp, 16hp engines. Use scenarios: - Replacing mufflers on a Honda GX390 13hp powered pressure washer, water pump, or compressor to restore exhaust and support regular maintenance. - Upgrading mufflers on 13hp/11hp Honda 390 and 340 engines in heavy-duty equipment such as a 37 ton log splitter or high-psi pressure washers. - Providing a compatible muffler solution for various clone engines in a shop, enabling use with Predator, Champion, Powerease, Rato, Loncin, Duromax, Dewalt, Simpson and other 11hp–16hp engines.