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Underhood, the new engine is a pretty obvious upgrade, but much of the other improvements in the '11 version of the S197 chassis are underneath. This handy, life-size display shows most of the new bits highlighted in blue. Most of these are tweaked suspension parts-larger sway bars, more robust lower control arms, and the all important Z-brace-plus the EPAS system and stiffer A pillars. Other less obvious upgrades are the deep-sump oil pan, 2.75-inch exhaust, and limited-slip differential.