Austrian tuner O.CT Tuning has gone all American this time, releasing upgrade packages for two of Chrysler’s most prominent products, Dodge Challenger SRT8 and Jeep Grand Cherokee SRT8. Both cars feature the same 6.4-liter V8 HEMI engine.

O.CT Tuning Challenger is the first car we look at; a car that came to the workshop with a standard 480 horsepower and left it with 565. The torque is increased too, from 637 to 730 Nm. To get that power O.CT technicians fitted the HEMI with a custom supercharger, a big intercooler, and optimized software. The system has the potential to generate well over 600 horsepower.

Jeep Cherokee SRT8 receives a similar treatment to O.CT Tuning Challenger, but here they went a bit deeper and machined the engine from 6.4 to 7.0 liter, thus increasing its output to a massive 720 horsepower. A version of this package is also available for the Ram 1500 pickup truck.

This goes to show that American muscle combined with German brain can accomplish some amazing feats. I mean, it took us to the moon!