A system for asynchronously delivering reductant from a reductant storage tank (110, 210) to a first selective catalytic reduction system (140, 240) and a second selective catalytic reduction system (150, 250) included in an aftertreatment system (100, 200), comprising: a reductant insertion assembly (120, 220) fluidly coupled to the reductant storage tank (110, 210), the reductant insertion assembly (120, 220) configured to be fluidly coupled to each of the first selective catalytic reduction system (140, 240) and the second selective catalytic reduction system (150, 250), the reductant insertion assembly (120, 220) including a first injector (123, 223) fluidly coupled to the first selective catalytic reduction system (140, 240), and a second injector (125, 225) fluidly coupled to the second selective catalytic reduction system (150, 250); and a controller (170, 270) communicatively coupled to the reductant insertion assembly (120, 220), wherein the controller (170, 270) comprises a timing determination module configured to determine: a first activation time at which the first injector (123, 223) is to be activated, a first delivery time for which the first injector (123, 223) is to be selectively activated for delivering a first amount of reductant into the first selective catalytic reduction system (140, 240), a second activation time at which the second injector (125, 225) is to be activated, and a second delivery time for which the second injector (125, 225) is to be selectively activated for delivering a second amount of reductant into the second selective catalytic reduction system (150, 250); characterized in that the controller (170, 270) is configured to instruct the reductant insertion assembly (120, 220) to insert the first amount of reductant into the first selective catalytic reduction system (140, 240) for the first delivery time and the second amount of reductant into the second selective catalytic reduction system (150, 250) for the second delivery time, such that the controller (170, 270) inserts into only one of the first selective catalytic reduction system (140, 240) or the second selective catalytic reduction system (150, 250) at any given time, wherein the first delivery time is equal to the second delivery time and/or the first amount of reductant is equal to the second amount of reductant. a reductant insertion assembly (120, 220) fluidly coupled to the reductant storage tank (110, 210), the reductant insertion assembly (120, 220) configured to be fluidly coupled to each of the first selective catalytic reduction system (140, 240) and the second selective catalytic reduction system (150, 250), the reductant insertion assembly (120, 220) including a first injector (123, 223) fluidly coupled to the first selective catalytic reduction system (140, 240), and a second injector (125, 225) fluidly coupled to the second selective catalytic reduction system (150, 250); and a controller (170, 270) communicatively coupled to the reductant insertion assembly (120, 220), wherein the controller (170, 270) comprises a timing determination module configured to determine: a first activation time at which the first injector (123, 223) is to be activated, a first delivery time for which the first injector (123, 223) is to be selectively activated for delivering a first amount of reductant into the first selective catalytic reduction system (140, 240), a second activation time at which the second injector (125, 225) is to be activated, and a second delivery time for which the second injector (125, 225) is to be selectively activated for delivering a second amount of reductant into the second selective catalytic reduction system (150, 250); the controller (170, 270) comprises a timing determination module configured to determine: a first activation time at which the first injector (123, 223) is to be activated, a first delivery time for which the first injector (123, 223) is to be selectively activated for delivering a first amount of reductant into the first selective catalytic reduction system (140, 240), a second activation time at which the second injector (125, 225) is to be activated, and a second delivery time for which the second injector (125, 225) is to be selectively activated for delivering a second amount of reductant into the second selective catalytic reduction system (150, 250); a first activation time at which the first injector (123, 223) is to be activated, a first delivery time for which the first injector (123, 223) is to be selectively activated for delivering a first amount of reductant into the first selective catalytic reduction system (140, 240), a second activation time at which the second injector (125, 225) is to be activated, and a second delivery time for which the second injector (125, 225) is to be selectively activated for delivering a second amount of reductant into the second selective catalytic reduction system (150, 250); characterized in that the controller (170, 270) is configured to instruct the reductant insertion assembly (120, 220) to insert the first amount of reductant into the first selective catalytic reduction system (140, 240) for the first delivery time and the second amount of reductant into the second selective catalytic reduction system (150, 250) for the second delivery time, such that the controller (170, 270) inserts into only one of the first selective catalytic reduction system (140, 240) or the second selective catalytic reduction system (150, 250) at any given time, wherein the first delivery time is equal to the second delivery time and/or the first amount of reductant is equal to the second amount of reductant.