The 430 version sports the "regular V8" (275hp); aero kit, AMG wheels (Staggered front/rear), and sport suspension/exhaust to accomodate the weight/character of the V8. Moreover, the interior is upgraded with a few interior tidbits to distance itself from the 320 version. If you're looking for a more "sporting" ride (closer parameters with your porsche, but not quite on the same level) you may want to consider the CLK 55 AMG.