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Home > 3'' Downpipe Exhaust For 2011-2016 LML 6.6L Duramax Diesel | SPELAB
Opposite-angle view of the wrapped stainless 3 inch downpipe for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML, with the O2 sensor bung centered on the body and SPELAB packaging at top.
Mirror-polish stainless 3 inch downpipe for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML, showing the 4-bolt turbo flange, heat-wrapped body, and V-band clamp beside the SPELAB box.
Detail collage of a silver 3 inch downpipe: threaded O2 sensor bung, T-bolt clamp over the exhaust wrap, woven wrap texture, and V-band flange with TIG weld beads for the 6.6L Duramax LML.
Tape-measured 4-bolt turbo flange and rear outlet of a mirror-polish 3 inch downpipe for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML, confirming the 3-inch bore.
Three-panel silver 3 inch downpipe with tape across the V-band rear outlet and 4-bolt turbo flange plus a full side profile, for the 6.6L Duramax LML.
Close-up of the polished V-band rear flange opening on a wrapped 3 inch downpipe, showing the band clamp and exhaust wrap edge, for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Black-coated version of the 3 inch downpipe for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML, with 4-bolt turbo flange, heat-wrapped body, and V-band clamp beside the SPELAB box.
Detail collage of a black 3 inch downpipe: threaded O2 bung, 4-bolt flange with mounting tab, wrap texture, and rear flange with two sensor bungs for the 6.6L Duramax LML.
Black 3 inch downpipe shown from both ends, rear V-band outlet and front 4-bolt turbo flange with O2 bung, for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Tape-measured black 4-bolt turbo flange and rear outlet of a 3 inch downpipe for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML, verifying the 3-inch diameter.
Bundle pairing a polished stainless up-pipe with bellows and two gaskets to a wrapped silver 3 inch downpipe for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Black up-pipe with bellows, gaskets, and a heat-wrapped silver 3 inch downpipe bundled together for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Coated black up-pipe and gaskets joined to a mirror-polish 3 inch downpipe at a rear-flange-forward angle, for the 6.6L Duramax LML in 2011-2016 Chevrolet Silverado GMC Sierra.
All-black combo of up-pipe with bellows, gaskets, and a wrapped black 3 inch downpipe for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Stainless up-pipe with gaskets and a silver wrapped 3 inch downpipe at a rear-flange-forward angle, for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Stainless up-pipe and gaskets paired with a black-coated wrapped 3 inch downpipe for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Delete hardware kit with brackets, hose, plugs, clamps, and bolts bundled with a black wrapped 3 inch downpipe for the 6.6L Duramax LML in 2011-2016 Chevrolet Silverado GMC Sierra.
Delete kit components and a mirror-polish silver 3 inch downpipe shown together for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Silver delete bracket set with hose and fasteners paired to a black wrapped 3 inch downpipe for the 6.6L Duramax LML.
Delete kit with polished hardware and a silver 3 inch downpipe at a rear-outlet-forward angle for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Opposite-angle view of the wrapped stainless 3 inch downpipe for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML, with the O2 sensor bung centered on the body and SPELAB packaging at top.
Mirror-polish stainless 3 inch downpipe for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML, showing the 4-bolt turbo flange, heat-wrapped body, and V-band clamp beside the SPELAB box.
Detail collage of a silver 3 inch downpipe: threaded O2 sensor bung, T-bolt clamp over the exhaust wrap, woven wrap texture, and V-band flange with TIG weld beads for the 6.6L Duramax LML.
Tape-measured 4-bolt turbo flange and rear outlet of a mirror-polish 3 inch downpipe for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML, confirming the 3-inch bore.
Three-panel silver 3 inch downpipe with tape across the V-band rear outlet and 4-bolt turbo flange plus a full side profile, for the 6.6L Duramax LML.
Close-up of the polished V-band rear flange opening on a wrapped 3 inch downpipe, showing the band clamp and exhaust wrap edge, for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Black-coated version of the 3 inch downpipe for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML, with 4-bolt turbo flange, heat-wrapped body, and V-band clamp beside the SPELAB box.
Detail collage of a black 3 inch downpipe: threaded O2 bung, 4-bolt flange with mounting tab, wrap texture, and rear flange with two sensor bungs for the 6.6L Duramax LML.
Black 3 inch downpipe shown from both ends, rear V-band outlet and front 4-bolt turbo flange with O2 bung, for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Tape-measured black 4-bolt turbo flange and rear outlet of a 3 inch downpipe for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML, verifying the 3-inch diameter.
Bundle pairing a polished stainless up-pipe with bellows and two gaskets to a wrapped silver 3 inch downpipe for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Black up-pipe with bellows, gaskets, and a heat-wrapped silver 3 inch downpipe bundled together for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Coated black up-pipe and gaskets joined to a mirror-polish 3 inch downpipe at a rear-flange-forward angle, for the 6.6L Duramax LML in 2011-2016 Chevrolet Silverado GMC Sierra.
All-black combo of up-pipe with bellows, gaskets, and a wrapped black 3 inch downpipe for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Stainless up-pipe with gaskets and a silver wrapped 3 inch downpipe at a rear-flange-forward angle, for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Stainless up-pipe and gaskets paired with a black-coated wrapped 3 inch downpipe for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Delete hardware kit with brackets, hose, plugs, clamps, and bolts bundled with a black wrapped 3 inch downpipe for the 6.6L Duramax LML in 2011-2016 Chevrolet Silverado GMC Sierra.
Delete kit components and a mirror-polish silver 3 inch downpipe shown together for the 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.
Silver delete bracket set with hose and fasteners paired to a black wrapped 3 inch downpipe for the 6.6L Duramax LML.
Delete kit with polished hardware and a silver 3 inch downpipe at a rear-outlet-forward angle for 2011-2016 Chevrolet Silverado GMC Sierra 6.6L Duramax LML.

3'' Downpipe Exhaust For 2011-2016 LML 6.6L Duramax Diesel | SPELAB

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Selected Variant SKU: SPES08046
$118.00
$218.00 -46% $118.00
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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.

Product Specifications

  • Engine: GM Duramax 6.6L LML Turbo-Diesel
  • Pipe Diameter: 3 inch
  • Material: Stainless Steel
  • Surface: Mirror Polish
  • Configuration: Catless
  • Flange Type: Bolt-on (4-Bolt) with O2 sensor bung
  • Weight: 2.32 kg (2320 g)

Key Features

  • Larger internal diameter than stock for dramatically increased exhaust flow
  • TIG-welded stainless steel construction with mirror polish
  • Reduces turbo lag and enhances throttle response
  • O2 sensor bung included for sensor retention
  • Direct bolt-on to the factory turbocharger

This Catless GM Duramax 6.6L LML Diesel (V8 Turbo-Diesel) 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)
  • O2 sensor bung
  • Mounting hardware

Who This Is For

2011-2016 Chevrolet Silverado / GMC Sierra 2500/3500HD owners with the 6.6L LML Duramax turbo-diesel who tow or drive hard and want to lower EGTs, sharpen turbo response, and prepare for a delete tune.

Check Before Choosing

  • Cab & Chassis exclusion: Will NOT fit Cab & Chassis trucks — only fits pickup models (2500/3500HD).
  • 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 on the LML.
  • Street legality: No — not CARB or EPA certified. Off-road / competition use only.
  • EGT effect: Lowers exhaust gas temperatures under sustained load — a key benefit for towing and hard driving.