Jaguar's pumped up the power and handling on its pretty kitty, the XKR, for next week's Geneva Motor Show. The result is a cat Jag claims is the fastest production Jaguar sports car ever. It's called the XKR-S and it's got the standard XKR's 5.0-liter supercharged V8 under the hood with some as-yet-unveiled upgrades to boost output to 542 bhp (up from 510 bhp) and 501 lb-ft o' torques (up from 461 lb-ft). We'd say "Faster, pussycat! Kill! Kill!" but it's just too soon.