The John Deere GX21167 manifold is an original equipment manufacturer (OEM) part designed to connect the engine's exhaust ports to the muffler system. This genuine manifold ensures proper exhaust gas flow, maintaining engine efficiency and reducing noise. It is a critical component for the exhaust system on various John Deere lawn and garden tractor models, including the D100, D105, D110, D120, D125, D130, D140, D150, D155, D160, D170, E100, E110, E120, E130, E140, E150, E160, E170, E180, L100, L105, L107, L108, L110, L111, L118, L120, L130, LA100, LA105, LA110, LA115, LA120, LA125, LA130, LA135, LA140, LA145, LA150, LA155, LA160, LA165, LA170, LA175, S100, S110, S120, S130, S140, S160, S170, S180, X105, X106, X107, X110, X115R, X116R, X120, X125, X126, X127, X130R, X135R, X140, X145, X146R, X147R, X155R, X165, X166R, X167R, Z225, Z235, Z255, Z335E, Z335M, Z345M, Z345R, Z355E, Z355R, Z365R, Z375R, Z425, Z435, Z445, Z465, Z525E, Z535M, Z535R, Z540M, Z540R, Z625, Z645, Z655, and Z665. Replaces part numbers GY20850 and GY20850B.