2015-21 Mustang GT 5.0L long-tube headers. Unholy Union. All tubes are CNC mandrel bent for optimal flow. Made from 304 stainless steel for maximum corrosion resistance. Starting with a CNC cut 3/8" thick flanges into 1-7/8" diameter primaries, 3" slip-fit collectors with merge spike, then fitting into 3" high-flow cats. Extended leads are built to fit MBRP and Corsa as well as SW Factory cat-back systems. The ultimate freedom in aftermarket connections! Mill finish, All TIG welded for strength and durability. These kits come with a 24-month warranty.