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																<h1><span xmlns="https://www.w3.org/1999/xhtml">YOUR #1 SOURCE FOR #2 POWER!!</span></h1>
																<span xmlns="https://www.w3.org/1999/xhtml">                            </span> Whenever you purchase a tuner from Diesel Power Products, we send it our via next day air. There is nothing else for you to do. Give us a call if you have any questions. Free Next Day Shipping on ALL Tuners!!!

    YOUR #1 SOURCE FOR #2 POWER!!

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Grand Rock offers 5 different styles of stacks available in an assortment of sizes.  From the left, Grand Rock introduces its newest style, the Aussie, available in 5, 6, and 7 inch.  Next, is the classic Straight Cut and then the Angle/Mitre Cut, both available in 4, 5, 6, and 7 inch.  Fourth over is called the Curved/Turnout, available in 4, 5, 6, and 7 inch.  Finally, on the right is the Bullhorn/Bullhauler, available in 5, 6, and 7 inch.

To order your Grand Rock Stack Kit, simply choose your options from the boxes in each category.  Some items will add to the "base price" and will show you accordingly how much it will increase the kit cost.  First off, you will choose whether you simply want a "cab-back" design, in which the hookup for the stacks is right at the back of the cab of the truck, and you will use your factory exhaust from there to the turbo.  Otherwise, you may choose "turbo-back," in which you will replace ALL exhaust from the turbo to the stack with four inch. 

Your next option will be stack size.  Four inch is the baseline size for stacks, and each additional inch in diameter,  costs an additional $100.  The Bullhorn/Bullhauler and Aussie stacks are not available in four inch, so if you are going to order these, you must choose either five, six, or seven inch.  Next, of course, is your stack style.  Straight cut (flat top) stacks are the baseline (no additional charge), but you may choose any of the five styles that suit your tastes. 

Next, you will choose your exhaust hookup size.  If you have stock exhaust, it is three and a half inch.  So, if you plan on leaving your stock underbed exhaust, choose three and a half inch, which will ship with a three and a half to four inch adapter, because Grand Rock only has either a four or five inch hookup size.  If you are purchasing a turbo back kit, choose four inch.  Finally, if you have already installed a 5" exhaust, then you would choose 5" hookup size.

And after this, YOU'VE DONE IT, you've built your Grand Rock stack kit!  Now get 'em put on, and start enjoying the sound and stares you're getting from your new stacks!




Grand Rock Dual Stack Kit 07.5-09 6.7L Dodge Cummins
Grand Rock Single Stack Kit 01-07 6.6L GM Duramax
DPP Price: $299.00 
SKU: GR-0107GMSINGLE