These Flowmaster Scavenger Series Elite headers are designed to replace the factory manifolds on 2011 to 2014 Mustang GT's. These headers feature 16 gauge 1-3/4 in. stainless primaries, 3/8 in. laser cut flanges and factory connections to bolt directly to the OE converters. The headers are ceramic coated for maximum durability and heat management, and will deliver noticeably better performance and efficiency.