Are shortie headers a useful upgrade?
eBay Motors: NO RESERVE Mustang Cobra SVT 4V Chrome Headers 4.6 (item 280317330096 end time Mar-08-09 20:27:01 PDT)
saw these. any idea of horsepower increase?
eBay Motors: NO RESERVE Mustang Cobra SVT 4V Chrome Headers 4.6 (item 280317330096 end time Mar-08-09 20:27:01 PDT)
saw these. any idea of horsepower increase?