jbaperformanceexhaustco is ready to upgrade the Challenger exhaust, and gain about 25hp and 30ft/lbs
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This is all pre-public sale, in a development sort of thing, to work out an aftermarket support is my take on it.
http://www.jbaheaders.com/More on this Challenger at
http://www.speedfactorycars.com/gallery.htmlFor a lot more about JBA:
http://justacarguy.blogspot.com/2009/02/open-house-tour-for-mustang-club-at-jba.html