A method of retrofitting a pulse ring assembly between an air filter outlet of an air cleaner system and an engine intake, the method comprising: connecting an outer tube (120; 220) to the air filter outlet, wherein the outer tube (120; 220) extends between an outer filter outlet end (122; 222) connected to the air filter outlet and an outer engine intake end (124; 224), wherein the outer tube (120; 220) comprises an interior surface (126; 226) and an exterior surface (128; 228), wherein the interior surface (126; 226) of the outer tube defines an outer tube passageway (132; 232) through the outer tube (120; 220) between the outer filter outlet end (122; 222) and the outer engine intake end (124; 224), wherein the outer tube (120; 220) comprises a pulse port (130; 230) extending between the interior and exterior surfaces into the outer tube passageway (132; 232); positioning an inner tube (140; 240) within the outer tube passageway (122; 232), wherein the inner tube (140; 240) extends along a longitudinal axis between an inner filter outlet end (142; 242) and an inner engine intake end (144; 244), wherein the inner tube (140; 240) comprises an interior surface (146; 246) and an exterior surface (148; 248), wherein the interior surface (146; 246) of the inner tube (140; 240) defines an inner tube passageway (152; 252) through the inner tube between the inner filter outlet end (142; 242) and the inner engine intake end (144; 244), wherein the inner filter outlet end (142; 242) is positioned within the outer tube passageway (132; 232) such that an outer pulse portion of the interior surface (126; 226) of the outer tube (120; 220) faces the exterior surface (148; 248) of the inner tube (140; 240), wherein filtered air is configured to flow from the air filter outlet to the engine intake; connecting the inner engine intake end (144; 244) to the engine intake; and connecting a pulse jet apparatus (160; 260) in fluid communication with the pulse port (130; 230) of the outer tube, wherein the pulse jet apparatus is configured to direct gas from the pulse port of the outer tube towards the outer filter outlet end. connecting an outer tube (120; 220) to the air filter outlet, wherein the outer tube (120; 220) extends between an outer filter outlet end (122; 222) connected to the air filter outlet and an outer engine intake end (124; 224), wherein the outer tube (120; 220) comprises an interior surface (126; 226) and an exterior surface (128; 228), wherein the interior surface (126; 226) of the outer tube defines an outer tube passageway (132; 232) through the outer tube (120; 220) between the outer filter outlet end (122; 222) and the outer engine intake end (124; 224), wherein the outer tube (120; 220) comprises a pulse port (130; 230) extending between the interior and exterior surfaces into the outer tube passageway (132; 232); positioning an inner tube (140; 240) within the outer tube passageway (122; 232), wherein the inner tube (140; 240) extends along a longitudinal axis between an inner filter outlet end (142; 242) and an inner engine intake end (144; 244), wherein the inner tube (140; 240) comprises an interior surface (146; 246) and an exterior surface (148; 248), wherein the interior surface (146; 246) of the inner tube (140; 240) defines an inner tube passageway (152; 252) through the inner tube between the inner filter outlet end (142; 242) and the inner engine intake end (144; 244), wherein the inner filter outlet end (142; 242) is positioned within the outer tube passageway (132; 232) such that an outer pulse portion of the interior surface (126; 226) of the outer tube (120; 220) faces the exterior surface (148; 248) of the inner tube (140; 240), wherein filtered air is configured to flow from the air filter outlet to the engine intake; connecting the inner engine intake end (144; 244) to the engine intake; and connecting a pulse jet apparatus (160; 260) in fluid communication with the pulse port (130; 230) of the outer tube, wherein the pulse jet apparatus is configured to direct gas from the pulse port of the outer tube towards the outer filter outlet end.