Replacing the down pipe between the headers and the catalytic converter is especially urgent in turbocharged GMC Sierras, where the addition of high-flowing aftermarket 1999-2017 down pipes produces notable gains in power. Fabricated from long-lived, strong materials like T-304 stainless steel, the down pipes you’ll find on AmericanTrucks are carefully chosen to give the best results for your machine’s performance. 1999-2017 catted down pipes offer big flow increases while including the catalytic converters that make the system using them completely street-legal in most states. If you’re planning on using the truck only on the track or the trail, there’s no reason not to add a 1999-2017 off-road down pipes kit, deleting the catalytic converters to squeeze out the last few drops of power and sound from your Sierra while rendering it illegal to use on road.
Shop All Performance Downpipes for Trucks
Fitment Includes:
- 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023 and 2024 Sierras
- Base, C3, Classic, HT, Hybrid, Nevada Edition, SL, Z71, Denali, SLE, 1500, SLT and WT Sierras
- Engines: 4.3L Vortec V6, 4.8L Vortec V8, 5.3L Vortec V8, 5.3L Flex-Fuel Vortec V8, 5.3L Vortec V8 Hybrid, 6.0L Vortec V8, 6.2L VVT Vortec V8, 4.3L EcoTec3 V6, 5.3L EcoTec3 V8, 6.2L EcoTec3 V8 Sierras
*Please see Sierra parts pages for any exceptions.
