If the 510 horsepower in the XKR isn't enough for you for the new 2012 Jaguar XKR-S, then you'll be happy to see the new-for-2012 XKR-S, which pushes the 5-liter supercharged V8 to 550 hp, with a similar 41 lb-ft increase in torque. 0-60 acceleration is 4.2 seconds 0.4 seconds faster than the XKR and the XKR-S has no speed limiter, so it can reach 186 MPH.