Renntech has made a career out of building programs for Mercedes models. Over the years, the German tuner has produced a handful of kits for a number of Mercedes models. A few on this hit list includes the CLS 63 AMG, E 55 AMG, C 63 AMG, and lest I forget, the SLS AMG. Now, Renntech has set its sights on the SLS AMG Black Series, the SLS AMG’s lighter and more powerful alter ego.