2015 Ford Mustang GT 5.0 headers. These headers will increase horsepower and improve sound over the OEM headers. These headers are designed with 1-7/8" primary tubes and 3" diameter lead pipes. These 304 stainless steel headers are TIG welded with 3/8" thick flanges and 3" diameter slip fit collectors with merge spikes. These are lifetime guaranteed and you get superior performance.