The performance saloon segment has for years been the exclusive domain of German manufacturers. Vehicles like the Audi RS6, the BMW M5 or the new Mercedes E63 AMG set the bar so high that most others don't even try to compete. So it's all the more surprising that luxury American brand Cadillac has suddenly hit back with the CTS-V, a lighting ride which has left a good many journalists shaken after test drives. 564hp and a massive maximum torque of 747Nm are a clear challenge to Munich, Ingolstadt and Stuttgart.

Tradition, as everyone knows, is an obligation to deliver. That is why GeigerCars.de is offering special performance tuning for the Cadillac CTS-V, timed to coincide with the American performance saloon's European launch. The four-door Cadillac with the tapered bonnet is powered by a classic eight-cylinder engine with a capacity of 6.2 litres, taken from the latest Corvette ZR1. The large intercooler and the compressor below are hidden under the massive power dome hood.

Thanks to an increase in air charge pressure, the engineers at GeigerCars.de have now conjured an impressive 619hp from the CTS-V at 5900 rpm, which means a top speed of over 320km/h thanks to a shortened fifth and sixth gear. Not only that, but they have raised the maximum torque to a brutal 850 Newton metres - a level few sports cars can match.