HPI stock replacement support set for the Nitro RTR RS4 3. These parts are located throughout the vehicle.

HPI rear hub set for the Nitro RS4 3. The rear axles are supported by the hubs.

HPI servo horn slide carburetor.  This servo horn set is for use with slide valve carbureted engines. This set is used on the HPI Nitro 3, Nitro MT, and Super Nitro vehicles.

HPI replacement lower mount set for the RS4 MT 2. These parts are located below the bulkheads.

HPI four shock cap set is the shock cap set for the Sport Shock, 2 sets.

HPI beveled differential gear set for the Nitro RS4 3. These gears are located in the differential.

HPI stock replacement recoil flywheel for the Nitro RS4 3. This is the part that holds the clutch shoes.

HPI stock replacement exhaust manifold for the Nitro 3. This part connects the tuned pipe to the crankcase.