The SPOOLOGIC Up-Pipe Install Kit SL-300-027 is the complete gasket-and-hardware kit for the up-pipes on 2001-2016 6.6L Duramax LB7, LLY, LBZ, LMM, and LML trucks — everything you'll touch when the up-pipes come off, in one box. Four MLS gaskets, twelve heat-treated up-pipe bolts, and twelve hardened washers. Backed by a 1-Year Limited Warranty.

Every part in this kit is single-use by design. MLS gaskets crush down to the exact roughness of the flange on first torque, and up-pipe bolts stretch and warp after one heat cycle at full EGT. Reusing any of them is the #1 cause of post-job leaks and sooty engine valleys — that’s why we built the kit around one-and-done, install-it-right hardware.

Common Up-Pipe Install Failure Symptoms

• Loud exhaust tick or hiss from the engine valley — reused MLS gasket at a manifold-to-up-pipe or up-pipe-to-turbo joint that already crushed on the previous install.
• Sooty deposits in the engine valley pan — a leaking up-pipe joint dumping exhaust gas onto the valley cover and pan.
• Slow spool, low boost, or high EGT — an exhaust leak upstream of the turbo bleeding off gas before it reaches the turbine wheel.
• Bolt backed out or snapped at torque — reused up-pipe hardware with stretched threads or a deformed underhead from the previous heat cycle.

Why You Replace All of This — Not Just the One That’s Leaking

Up-pipe hardware and gaskets are not designed to be reused. Here’s what’s actually happening to the parts you’re tempted to put back:

• Multi-layer steel (MLS) gaskets — stacked thin steel sheets bonded with an elastomer coating. On first torque-up the layers crush down to mate the exact surface roughness of the flange. Once crushed they cannot crush again to a new surface. Reused MLS gaskets are the #1 cause of post-job exhaust leaks at the up-pipe.
• Up-pipe bolts — live in the hottest part of the engine. Threads stretch, heads warp, and the underhead bearing surface deforms after one heat cycle at full EGT. New hardware is cheap insurance and torques predictably the second time.
• Up-pipe washers — spread the bolt clamp load across the flange and protect the gasket from being chewed up by the bolt head. Used washers are dished and gouged from the prior install — they don’t spread load evenly anymore.

Component Breakdown — What Each Piece Seals

• 2 manifold-to-up-pipe gaskets — round MLS gaskets that seal the up-pipe to the exhaust manifold on each bank. This joint sees full exhaust gas temperature and pressure. A leak here is loud, sooty, and dumps exhaust gas into the engine valley.
• 2 up-pipe-to-turbo gaskets — triangular MLS gaskets that seal the up-pipe to the turbo inlet on each bank. Same conditions, same consequences.
• 12 up-pipe bolts — heat-treated black oxide bolts that hold both up-pipe ends to the manifold and turbo flanges.
• 12 up-pipe washers — flat washers that spread the bolt clamp load evenly across the flange.

Material Technology — Why Each Material Was Chosen

• Multi-layer steel (MLS) construction — all four up-pipe gaskets are MLS, not composite. MLS uses three or more thin steel layers with an elastomer coating, each layer free to flex independently as the joint grows and shrinks with heat. This is the construction that survives 1,200°F+ exhaust gas temperatures on the hot side of the turbo.
• Heat-treated black oxide bolts — the up-pipe bolts are heat-treated to the OE grade specification and finished in black oxide so they handle the clamp load and the heat without stretching or backing out.
• Hardened steel washers — the flat washers are hardened steel so they spread the bolt clamp load across the flange without dishing under torque.

Install Notes

• Do not reuse any gasket, bolt, or washer in this kit — every piece is single-use by design.
• Clean every mating surface before installing the new gasket. MLS gaskets cannot bridge over carbon deposits, machining burrs, or old gasket material. A razor scraper and brake clean is the minimum.
• Follow the GM service manual torque specs and sequence for the up-pipe bolts at both the manifold and turbo ends.
• Inspect the up-pipes themselves for cracks at the bellows or flange welds before reinstalling — a cracked up-pipe will leak past any gasket.

Features

• Complete up-pipe install kit for 2001-2016 LB7 / LLY / LBZ / LMM / LML / LGH Duramax
• Multi-layer steel construction on all four up-pipe gaskets
• Heat-treated black oxide up-pipe bolts
• Hardened flat washers for even clamp load
• Covers both manifold-to-up-pipe and up-pipe-to-turbo joints
• Backed by a 1-Year Limited Warranty

What’s Included

• 2 manifold-to-up-pipe gaskets
• 2 up-pipe-to-turbo gaskets
• 12 up-pipe bolts
• 12 up-pipe washers

Fits 2001-2016 6.6L Duramax LB / 6.6L Duramax LLY LMM LGH

• 2001 – 2016 Chevrolet Silverado GMC Sierra 2500 3500 6.6L Duramax LB7 LLY LBZ LMM LML
• 2006 – 2016 Chevrolet Express GMC Savana 2500 3500 4500 6.6L Duramax LLY LMM LGH

Turbo Applications

This install kit fits the following factory turbochargers:

• Garrett GT3788VA (2004.5-2016 6.6L Duramax LLY/LBZ/LMM/LML/LGH)
• IHI RHG6 (2001-2004 6.6L Duramax LB7)

1-Year Limited Warranty

Every SPOOLOGIC Up-Pipe Install Kit is covered by a 1-Year Limited Warranty against defects in materials and workmanship for the original purchaser. To initiate a warranty claim, the kit must first be shipped back to SPOOLOGIC at the customer’s expense for inspection. If SPOOLOGIC determines the kit is defective in materials or workmanship, a replacement will be shipped at SPOOLOGIC’s cost. Warranty does not cover labor, downtime, towing, consequential damages, failures caused by improper installation, failures caused by dirty or damaged mating surfaces, reuse of any kit component, or use outside the listed fitment.