Home > Hop Up Kits > GX340, GX390, 420 Predator, & 13/15hp OHV > Stage 4 > 440 Duromax
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Hop Up Kit, 440 Duromax, Stage 4 Hop Up Kit, 440 Duromax, Mud Motor Kit, Stage 4
Stage 4 Kit for 440 Duromax, featuring everything from a Ported and Milled Head with Stainless Valves,  Stud Kit, and HD Valve Train Components. Allows up to 35+ HP from a 440 Engine. 440 Duromax 18hp stage 4 kit for best torque, and overall best performance in mud motors & marine applications