This pipe kit removes the SCR (Selective Catalytic Reduction) and DEF/Urea system from your Cab & Chassis vehicle. You will need to measure from the cab to the axle; If it is under 70″, then purchase this kit.

NOTE: This is the second pipe kit required when doing a DPF/DEF delete on Cummins Cab & Chassis vehicles. The first pipe kit would be PART NUMBER# 21122 (Kit with no muffler) or PART NUMBER# 21123 (Kit WITH a muffler).