Exhaust Headers for Mercedes Benz SL55 AMG (2003-2008) 5.4L Supercharged V8High Flow Mid Length Exhaust Headers for 2003 2008 Mercedes Benz SL Class (M113K R230) Designed for competition use, these mid length exhaust headers eliminate severe factory exhaust restrictions to drastically reduce back pressure and unlock top end power. The Stock SL Class Exhaust Bottleneck The factory M113K and M113 exhaust manifolds are notoriously restrictive, utilizing a cast log style design that forces exhaust pulses to collide. This