The name "Crossfire" comes as a reference to the distinctive character lines that run from front to rear through the body sides. They create a surface that is upward facing as it passes over the rear fender, but they cross mid-way through the door to form a downward facing surface as they reach the front fender. Also, since this is the first car to be built after Chrysler merged with Daimler-Benz and it shares elements from both houses, the name is a reference to their collaboration.
The SRT-6 trim level, as both coupe and convertible, featured an AMG supercharged engine delivering 330 hp (246 kW) and 310 lb·ft (420 N·m) of torque. Other SRT-6 model specific features included suspension and brake modifications, a front fascia air dam and a fixed vs. retractable rear spoiler. The Crossfire SRT-6 model used the same drive-train, suspension, and braking components as those used on the Mercedes-Benz SLK 32 AMG.
In 2006, the SRT-6 was changed to special order only, though none seem to have been sold in the U.S.
Source: Wikipedia (original)