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Home > SPELAB 3'' Downpipe Exhaust For 2004.5-2010 LLY LBZ LMM 6.6L Duramax Diesel
Cast-style black up-pipe with flex section, two gaskets, and a wrapped 3 inch downpipe for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM, packed in a SPELAB box
Mirror-polished 3 inch downpipe wrapped in tan exhaust heat tape, V-band ends ready for a 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM, shown with SPELAB box
Unwrapped mirror-polished 3 inch downpipe with a roll of heat tape and two band clamps, plus the finished wrapped look, for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM
Close-up views of a polished stainless 3 inch downpipe in heat wrap, showing TIG-welded V-band flange, mounting tab, and open catless bore for a 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM
Tape measure across the V-band flange of a wrapped mirror-polished 3 inch downpipe, checking flange diameter for a 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM turbo-diesel pickup
Black-coated 3 inch downpipe with tan heat wrap on the mid-section and V-band ends, for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM, beside its SPELAB box
Detail shots of a black-finish 3 inch downpipe with heat wrap, band clamps, V-band flange tab, and open catless bore for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM
Tape measure across the opening of a black-finish 3 inch downpipe, showing bore and flange size for a 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM
Angled close-up of a black V-band flange and welded heat-shield tab on a catless 3 inch downpipe for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM, edge of its heat wrap visible
SPELAB up-pipe and wrapped 3 inch downpipe bundled with black exhaust pipes, connector tube, and band clamps for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM
Up-pipe and wrapped 3 inch downpipe kit paired with coiled black hose, anodized plugs and fittings, and small clamps for a 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM
Polished aluminum air intake tubing with couplers and clamps bundled with an up-pipe and wrapped 3 inch downpipe for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM
Cast-style black up-pipe with flex section, two gaskets, and a wrapped 3 inch downpipe for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM, packed in a SPELAB box
Mirror-polished 3 inch downpipe wrapped in tan exhaust heat tape, V-band ends ready for a 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM, shown with SPELAB box
Unwrapped mirror-polished 3 inch downpipe with a roll of heat tape and two band clamps, plus the finished wrapped look, for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM
Close-up views of a polished stainless 3 inch downpipe in heat wrap, showing TIG-welded V-band flange, mounting tab, and open catless bore for a 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM
Tape measure across the V-band flange of a wrapped mirror-polished 3 inch downpipe, checking flange diameter for a 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM turbo-diesel pickup
Black-coated 3 inch downpipe with tan heat wrap on the mid-section and V-band ends, for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM, beside its SPELAB box
Detail shots of a black-finish 3 inch downpipe with heat wrap, band clamps, V-band flange tab, and open catless bore for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM
Tape measure across the opening of a black-finish 3 inch downpipe, showing bore and flange size for a 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM
Angled close-up of a black V-band flange and welded heat-shield tab on a catless 3 inch downpipe for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM, edge of its heat wrap visible
SPELAB up-pipe and wrapped 3 inch downpipe bundled with black exhaust pipes, connector tube, and band clamps for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM
Up-pipe and wrapped 3 inch downpipe kit paired with coiled black hose, anodized plugs and fittings, and small clamps for a 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM
Polished aluminum air intake tubing with couplers and clamps bundled with an up-pipe and wrapped 3 inch downpipe for 2004.5-2010 Chevrolet Silverado GMC Sierra 6.6L Duramax LLY LBZ LMM

SPELAB 3'' Downpipe Exhaust For 2004.5-2010 LLY LBZ LMM 6.6L Duramax Diesel

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Selected Variant SKU: SPES08508
$209.99
$292.99 -28% $209.99
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Description Fitment Installation Guide & FAQ Shipping & Returns

What does a downpipe do?

The downpipe on your turbocharged vehicle is directing the exhaust gases out of the turbine housing into the exhaust system. An aftermarket downpipe will typically be larger in diameter and either uses a high-flowing catalytic converter or remove the catalytic converter altogether.

By removing the factory downpipe and replacing it with a high flowing unit you are allowing the turbo to more efficiently move gases away from the turbine which creates more power. Since the factory restrictions are now gone you can increase the boost on the vehicle as the factory downpipe is a choking point for performance.

Key Features

  • 3" mandrel-bent stainless steel construction
  • Larger internal diameter for dramatically increased exhaust flow
  • Reduces turbo lag and enhances throttle response
  • Direct bolt-on to factory turbocharger
  • TIG-welded stainless steel with mirror polish

Product Specifications

  • Engine: GM Duramax 6.6L LLY / LBZ / LMM Turbo-Diesel
  • Pipe Diameter: 3 inch
  • Material: Stainless Steel
  • Surface: Mirror Polish
  • Configuration: Catless
  • Flange Type: V-Band
  • Weight: 2.74 kg (2740 g)

Who This Is For

2004.5-2010 Chevrolet Silverado / GMC Sierra 2500/3500HD owners with the 6.6L LLY / LBZ / LMM Duramax turbo-diesel who want a 3" downpipe for lower EGTs and delete tuning.

This Catless LLY/LBZ/LMM Duramax downpipe replaces the restrictive factory downpipes and removes the catalytic converter for maximum flow. Engineered for Chevrolet / GMC, it’s a direct bolt-on upgrade that delivers lower EGTs, sharper turbo response, and increased flow.

What's Included

  • Downpipe
  • Gasket(s)
  • V-Band clamp(s)
  • Mounting hardware

Check Before Choosing

  • Cab & Chassis exclusion: Will NOT fit Cab & Chassis trucks — only fits pickup models.
  • Tune required for delete: Yes — a diesel tune (EFI Live / HP Tuners) is required to clear the CEL/DPF codes and safely manage the increased flow.
  • Year range: 2004.5-2010 covers the LLY (2004.5-2005), LBZ (2006-2007), and LMM (2007.5-2010) Duramax variants.
  • Street legality: No — off-road / competition use only.