SPOOLOGIC Heavy Duty 304SS High-Flow Bellowed Up-Pipe Kit (California Emissions)

The SPOOLOGIC SL-510-021 Heavy Duty 304SS High-Flow Bellowed Up-Pipe Kit upgrades the exhaust path between the manifolds and turbocharger on 2002–2004 Chevrolet Silverado and GMC Sierra pickups with the 6.6L Duramax LB7. The mandrel-bent stainless steel pipes and internally sleeved bellows reduce restriction to support quicker turbo response and lower exhaust gas temperatures under load. This kit retains the California-emissions EGR cooler connection. Both pipes, new flange gaskets, and 12 up-pipe mounting bolts are included.

Features

• 304 stainless steel construction with mandrel-bent main tubing
• 2-inch outside-diameter main tubing with a 0.120-inch wall (11-gauge)
• Three-layer bellows with internal sleeves provide flexibility through repeated heat cycles
• Larger, smoother exhaust passages reduce restriction and exhaust backpressure
• Designed to support faster turbo response and lower exhaust gas temperatures
• Welded mounting flanges and new gaskets seal the manifold and turbocharger connections
• Supplied up-pipe mounting bolts for all four main flange connections

⚠️ Fitment Notes

For LB7 pickups equipped with the California-emissions EGR configuration. The passenger-side pipe retains the EGR cooler connection. Check the underhood emissions label and original pipe before ordering. California Emissions identifies the vehicle configuration; it does not indicate CARB approval. Does not fit Federal-emissions LB7 or 2004.5 LLY applications. These pipes use the factory manifold connection locations. Verify compatibility before combining them with aftermarket manifolds or a relocated turbocharger.

Bellowed Up-Pipe Design

Up-pipes carry exhaust energy to the turbine before it exits through the downpipe. Smooth tubing and internally sleeved bellows help maintain an open flow path, while the flexible sections accommodate expansion and contraction. A sound seal at each flange helps keep exhaust energy available to drive the turbocharger. Performance changes depend on engine load, the rest of the exhaust system, and the condition of the pipes being replaced.

What's Included

• 1 driver-side 304 stainless steel bellowed up-pipe
• 1 passenger-side 304 stainless steel bellowed up-pipe with EGR connection
• 1 Up-Pipe Gasket Kit (SL-310-029) — 2 lower manifold-side gaskets and 2 upper turbo-side gaskets
• 1 up-pipe EGR connection gasket
• 12 up-pipe flange bolts
• 2 washers

Fitment

• 2002–2004 Chevrolet Silverado 2500 HD 3500 HD — 6.6L Duramax LB7 — California-emissions EGR configuration
• 2002–2004 GMC Sierra 2500 HD 3500 HD — 6.6L Duramax LB7 — California-emissions EGR configuration

Common Up-Pipe Leak Symptoms

• Dry black soot around a bellow, weld, or flange
• Ticking, puffing, or hissing exhaust noise, especially under load
• Slower turbo spool-up, reduced boost, or reduced pulling power
• Higher exhaust gas temperatures under comparable operating conditions

Inspect the exhaust and charge-air systems to locate the fault. These symptoms can also result from other leaks or turbocharger problems.

Installation Notes

• Preparation: Work on a cold engine and follow the vehicle service procedure for access. Clean the mating faces and inspect the manifolds, turbocharger inlet, and supporting brackets.
• Alignment: Start all connections loosely and align the pipes before final tightening.
• Assembly: Fit new gaskets at each disturbed connection. Use the supplied up-pipe bolts and retain serviceable EGR connection fasteners where not supplied.
• Tightening: Follow the specified torque and sequence for the application and hardware. Do not pull misaligned flanges together with the bolts or twist the bellows.
• Leak check: Reinstall all removed brackets and heat shields, confirm clearance from wiring and hoses, and check for leaks. Inspect the connections again after a complete heat cycle and cool-down.

Related Up-Pipe Kits

• SL-510-020 — 2001–2004 LB7 Federal Emissions
• SL-510-022 — 2004.5–2005 LLY
• SL-510-023 — 2006–2007 LBZ
• SL-510-024 — 2007.5–2010 LMM
• SL-510-025 — 2011–2016 LML
• SL-510-026 — 2017–2026 L5P

OEM Cross-References

• GM: 97223167 — driver-side up-pipe
• GM: 97246389 — passenger-side up-pipe
• GM: 97188685 — lower up-pipe gasket
• GM: 97192618 — upper up-pipe gasket
• GM: 97328807 — EGR connection gasket
• GM: 11611132 — up-pipe mounting bolt reference

⚠️ Not for Sale in California

Not CARB approved. Not legal for sale or use in the state of California.

1-Year Limited Warranty

This SPOOLOGIC up-pipe kit carries a one-year limited warranty against defects in materials and workmanship from the original purchase date. Contact SPOOLOGIC for return authorization before sending the product for inspection with dated proof of purchase. Approved claims are resolved through repair or replacement at SPOOLOGIC’s discretion. The customer is responsible for all warranty shipping charges. Improper installation, overtightened fasteners, incorrect applications, damage caused by other failed components, environmental corrosion, normal heat discoloration, and cosmetic wear are not covered. Labor, removal, reinstallation, towing, downtime, and replacement gaskets used during subsequent service are excluded, subject to applicable law. See the SPOOLOGIC Warranty Policy for complete terms.