2015-17 Shelby Mustang GT350 5.2L long-tube headers. Starting with our durable 3/8" thick flanges into 1-7/8" diameter primaries, 3" slip-fit collectors with merge spike, then fitting into 3" catted leads. Fits factory connection point to the vehicle?s factory exhaust. No-kinks CNC mandrel belt pipes give a boost of power and longevity with our Lifetime Warranty on our beautiful 304 stainless steel.