Headers and exhaust systems for the '07 GT 500 are now available from JBA, a company owned by longtime Shelby and Ford big-block fanatic, J. Bittle. The long-tube headers have large-diameter mandrel-bent stainless primary tubes and 3/8-inch thick laser-cut flanges. PN 6695S also has JBA's patented Firecone merged collector. The exhaust system has Mandrel-bent tubing, JBA high-flow stainless mufflers, and 31/2-inch rolled-lip stainless chrome-plated tips. JBA, 800/830-3377; www.jbaheaders.com.