SPOOLOGIC 3in Turbo Downpipe

The SPOOLOGIC 3-Inch Turbo Downpipe SL-520-023 replaces the turbo outlet-to-exhaust pipe on 2015.5–2016 Chevrolet Silverado 2500 3500 and GMC Sierra 2500 3500 pickups with the 6.6L Duramax LML engine. Its mandrel-bent tubing and fitted heat wrap suit the late LML layout with a three-bolt lower exhaust connection.

Features

• 3-inch mandrel-bent tubing provides a smooth exhaust flow path
• Designed to reduce restriction after the turbocharger
• Preinstalled heat wrap helps limit radiant heat transfer
• V-band-style turbo connection and three-bolt lower exhaust flange
• Welded threaded ports
• Integrated mounting bracket
• Black exterior finish

What’s Included

• 1 3-inch turbo downpipe with welded flanges, threaded ports and mounting bracket — SL-520-023
• 1 Heat wrap — preinstalled
• Heat-wrap retaining clamps — preinstalled

Fitment

• 2015.5-2016 Chevrolet Silverado GMC Sierra 2500 3500 6.6L Duramax LML

⚠️ Check the connection where the bottom of the downpipe meets the exhaust system, especially on 2015 trucks. This version requires the three-bolt lower flange. For the earlier circular-clamp configuration, use SL-520-022.

OEM Cross-References

• Turbo downpipe — GM: 12674630 / 12655717

OEM numbers are provided for identification only. This is a SPOOLOGIC replacement part.

⚠️ Emissions Notice

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

1-Year Limited Warranty

Every SPOOLOGIC 3in Turbo Downpipe carries a 1-Year Limited Warranty against defects in materials and workmanship for the original purchaser from the original purchase date. Coverage excludes damage caused by improper installation, unsupported or misaligned connections, or physical damage. Normal heat discoloration is not covered. Claims require dated proof of purchase. Contact SPOOLOGIC for return authorization before shipping the component for inspection. If inspection confirms a covered defect, SPOOLOGIC will replace the covered component. Customers pay warranty shipping in both directions; labor and related costs are not covered. See the SPOOLOGIC Warranty Policy for full terms.