The KLEEMANN vario-valve header back exhaust system for the SLS AMG features smooth, mandrel bent piping, precision TIG welds and is constructed of 304 stainless steel.  Exhaust gas travels through our high-flow steel catalysts, True-X crossover, center resonators and our unique remote controlled vario-valve muffler bypass which offers either factory-quiet operation, or race track-quality exhaust notes.