Porsche GT3 RS 4.0 v BMW M3 GTS v Mercedes C63 AMG Black Series. On street and circuit Written by Tony on May 5, 2012. Posted in 3-series, M3, Reviews, Videos Tags: C63 AMG, E92, GT3 RS, M3, M3 E92, M3 GTS, Mercedes, Porsche, Porsche GT3 RS Trackback from your site.
