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7L 4" Turbo Back Exhaust (421039 / 421040)
Some years you will only run 2 mounting bolts instead of 3
Prevent oil from contaminating your intake
severe engine damage is prevented
2007.5-2014 Duramax LMM/LML Bully Dog Pillar Mount w/ Speaker (33307) 2010 7L 4" Turbo Back ExhaustThe custom A Pillar mounting system is the cleanest and most convenient install for your device. Installation is a snap. They are made to make your unit easy to access, without obstructing the drivers view of the road once installed in the mount. All of our custom A Pillars can be painted to match any vehicle interior color for ultimate customization. All parts are made from top quality materials, tested for a perfect fit.
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