Made out of high quality 304 stainless steel these "shorty" headers are designed as a direct bolt-on to the factory exhaust system. Made out of high quality 304 stainless steel these short tuned length headers are designed as a direct bolt on and when used with our short mid pipes they will bolt on to the existing factory or after market cat-back system. ALL BBK exhaust headers are pressure tested to ensure leak free performance. Each Stainless Steel short tuned length exhaust header for the 2005-2009 Mustang GT has been designed and dyno tested at the BBK headquarters in Southern California to Maximize performance. Part number 16125 the MSRP is $459.99. Contact BBK at (951) 296-1771 www.bbkperformance.com