Two of the most impressive V-8s to come around, urn, ever, are GM's supercharged 6.2-liter (ZR1, ZL1, CTS-V) and AMG's twin-turbo 5.5-liter (E63, CLS63, SL63, etc.). The former, known as LS9 or LSA, offers 556 to 638 hp and 551 to 604 Ib-ft of torque, while the latter, called M157, achieves 518 to 550 hp and 516 to 590 Ib-ft. Both are refined, euphonious, and a pleasure to pilot, even when not motoring at Mach speed. To this short list, I add one more: Audi's new twin-turbo 4.0-liter, aka EA 82.
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