Jeremy test drives the insanely-tuned Mercedes Brabus SL Bi-Turbo Roadster before handing it over to the Stig. It may have a volcano under the bonnet but can it power its way up the fabled Top Gear power lap board? Go to http://www.youtube.com tosee a full list of all high quality videos available on the Top Gear YouTube channel and don’t forget to visit http://www.topgear.com for all the latest news and car reviews.