2021+ F-150 Improve the sound and performance on your Ford F-150 with premium headers from Stainless Works. American-Made and designed for the 2015+ Ford F-150 these headers feature 1-7/8" primary tubes that are CNC mandrel bent to increase air flow and engineered to create power.; Fully TIG Welded for Strength and Beauty; These headers come with 3" collectors as well as high-flow catalytic converters that flow into either an x-pipe or y-pipe depending on the connection.; Stainless Works Header Kits are 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 material and craftsmanship and as always our products are proudly made in the USA.; Features:; Factory Connection or Performance Connect; High Flow Cats; 1-7/8" Primary Tubes; Lifetime Warranty on Stainless Works; Smooth Mandrel Bends Optimize Exhaust Flow