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There's no doubting the big rig sound a set of stacks produce, and Grand Rock has been building both big rig, as well as pickup, stack kits for years. We've put together these kits that will include all of the correct hardware to include everything from your turbo all the way to a set of stacks in the bed of your Cummins. You can select from any of the five available stack styles, as shown below, as well as choose what diameter stack you're after. Some stacks (Aussie and Bullhorn) are not available in 4", but all other styles will be available in sizes 4", 5", 6", and 7" diameters.
Kits designed for 4" stacks will include a 4" bed kit (T-Pipe), while all other sizes will include a 5" bed kit. Each of the 5" bed kits are even specific as to whether they will mount to a 5", 6", or 7" stack due to their varying clamp sizes to mount the stack to the inside bed rail. This kind of attention to detail is what separates Grand Rock apart from the rest.
All you need to do is determine what size and style of stacks you're after, and we'll make sure you get all of the parts to mount it up. Kit includes complete bed kit/T-Pipe, pair of stacks, complete 4" straight pipe exhaust from the turbo to the bed kit, and all of the mounting hardware.
- ManufacturerGrand Rock
- MPNDC-9402-4SK | DC-9402-5SK | DC-9402-6SK | DC-9402-7SK
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Hey there, how big is the down pipe, and are they compatible with any exhaust brake??
This will come with a 4"" downpipe. Depending on the manufacture of brake, some modifications would be required to mate this with an exhaust brake. Give us a call and we can inform you on what would have to be done. 888-993-4373-TL
Looking for set that doesn't go through the bed but up by cab and flatbed. Have a culb can?
These are universal kits but are designed to be installed in truck beds. I do not have a specific kit for flatbeds as there are to many variations of flat bed designs. -TL