Up-Pipe Bolt Set (12pc) - 2001-2016 GM 6.6L Duramax | Replaces 116121500

Kill Exhaust Leaks Before They Kill Your Turbo Response. Duramax up-pipe bolts are single-use by design — stretched, heat-cycled, and seized by the time you're back in there. This complete 12-piece high-strength bolt set lets you reseal both up-pipes properly instead of reusing fatigued factory hardware that leaks and ticks under boost. Complete 12-piece set — services both up-pipes High-strength 12-point bolts resist stretching and heat fatigue Direct replacement for factory hardware (replaces 116121500) Fits 2001-2016 Chevrolet Silverado / GMC Sierra 2500/3500 6.6L Duramax (LB7, LLY, LBZ, LMM, LML)