Youˇ¦ve seen the sketch, now here is the real deal: the Jaguar/Rocketsports Racing XK-RS concept that is debuting this week at the Chicago auto show. What excites us so much? Try 550 hp and 500 lb-ft, for starters. But the stroked 5.0-liter AJ-V8 Trans-Am racing engine isnˇ¦t the only noteworthy feature.

The XK-RS also boasts Penske coil-over shocks, cross-drilled Brembo brakes (13-inch front, 12-inch rear) and underbody tunnels that help produce twice as much downforce as the stock XK. Rocketsports also swapped the production carˇ¦s six-speed automatic transmission for a five-speed manual transaxle. The weight distribution is a balanced 50/50. Still, bad news remains: Jag says it has no production plans for the XK-RS.