Audi S8 Plus is an answer to a question nobody asked. While the existing S8 is already very powerful with its 520 hp 4.0 TFSI V8, the S8 Plus employs modified exhaust valves and turbochargers with revised inner geometry and higher boost pressure to produce another 85 horses. That means a total of 605 hp! Meanwhile, peak torque is lifted from 479 to 516 lbft, or even 553 lbft in overboost. This is the most powerful version of 4.0 TFSI engine yet, eclipsing even the 580 hp Bentley Continental GT3-R
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