5, 6, or 7 Inch Dual Turbo-Back Stack Kit
01-06 Chevy/GM 6.6L Duramax Diesel
By Grand Rock

Gives your Chevy Diesel Pickup that "Big Rig" look!

• Great flow-improved performance.
• Functional-Routes exhaust fumes above and away from livestock, car haulers, and cargo where diesel smoke is unwanted.

Complete turbo-to-stack kit, aluminized 4" pipe with 5" in-bed t-pipe. Internal mufflers are also included, but do not have to be installed for proper mounting.
01-07 Chevy/GM 2500/3500 6.6L LB7 & LLY Duramax Diesels: 4" inch front-pipe with 4" pipe to stack t-pipe.
These kits will NOT fit the new body style LMM Duramax Diesels.
These kits do eliminate all stock mufflers & cat converters, for off road use only.

These kits include your choice of: aussie style stacks, mitre cut, bull hauler, straight-cut, or turnout.
Please note that Aussie & Bull-Hauler Stacks are NOT available in 4".

The selection of your stack size & style may affect the price as noted in the drop down options.

Kits include everything needed, including down-pipe, intermediate pipe, t-pipe, & all mouting hangers & hardware to mount the stacks.

36" Stacks are standard and protrude above the cab 1-2 inches in most cases, or about 46" above the bed floor.
48" Stacks are optional and the top of the stack will be about 58" above the bed floor.

Please select the size of the stack you wish to mount in the kit below so that we can include proper mouting hardware. Please remember that the bottom of your stack MUST be 5" O.D. to properly work with this kit.


Please allow 2-3 weeks for delivery.

Due to availability issues, we need to allow to up to 6 weeks delivery time on certain stack styles. Please call for availability before ordering.