Upgrade to Long Tube headers on your 2020-21 Chevy Silverado or GMC Sierra HD with this system from Stainless Works. Unleash that 6.6L motor with 1-7/8" primaries that flow into a 3" collector with an integrated merge spike. This system comes with high flow cats and a Y-pipe for a simple bolt-on install.; Out of the box this system fits the 6.6L gas motor in both 2 wheel and 4 wheel drive. It fits all cab/bed configurations and will connect to the factory exhaust or other aftermarket system that uses the factory connection point.; Built from corrosion resistant 304 stainless steel our headers are TIG welded for strength and durability at our state-of-the-art facility in Streetsboro Ohio. We stand by our products with a lifetime warranty on materials and craftsmanship and as always our products are proudly made in the USA.