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Stainless Works 18-19 Dodge Durango 6.4L 1-7/8in Primaries Headers w/ High-Flow Cats 2002-gmc-envoy-xl-esi9739641 RECOMMENDED USAGE: Best for vehiclesImprove the sound and performance on your Durango with premium headers from Stainless Works. American Made and designed for the 2018+ Dodge Durango SRT 6. 4L, these headers feature 1 7 8" primary tubes that are CNC mandrel bent to increase air flow, and engineered to create power. These headers come with 3" slip fit collectors, as well as high flow catalytic converters that flow into 3" lead pipes, merging into a flanged leads to allow an easy