 However, an S197 chassis from 2005 to 2009 model years can be used to build an FR500S or FR500C variant.The FR500S featured a racing version of the 4.6L Ford Modular engine outputting 320 HP (brake / crank) coupled to a Tremec T56R close-ratio 6-speed transmission, while the FR500C featured the 5.0L "Cammer R50" engine delivering , via a Tremec T-56R.FR500 race cars vary greatly depending on what racing series they were designed for.