Grand Rock Turbo Back Stack Kits Only (without stacks)
Grand Rock Turbo Back Stack Exhaust Kits are High Quality diesel pickup truck stack exhaust systems. Turbo Back Kits for NON-DPF Ford Powerstroke, Dodge Cummins, GMC Chevy Duramax Stack installation!
Turbo Back Stack Kits for installing 4 Inch Stacks use all 4 inch clamps, hardware and piping.
Turbo Back Stack Kits for installing 5, 6, 7 and 8 Inch Stack use 4 inch clamps, hardware, and piping below the bed and expands to 5 inch above the bed- The inlet of the t-pipe is 4 inch, the t-pipe expands to 5 inch above bed, t-pipe, clamps and hardware above bed are 5 inch. Our 5, 6, 7 and 8 inch stacks have 5" OD Base that fits into the t-pipe outlets.
If you only need to downpipe, midpipe(s) and hardware and have already purchased a Grand Rock Cat Back Bed Kit/Installation Kit, you can order it below.