"In 2005, Chrysler released the SRT-6, which featured an advertised 330 horsepower and 310 ft-lbs of torque.
Those performance numbers were later found to be false. It is believed that Daimler-Chrysler did not want the performance of the Crossfire to appear to be equivalent of the 2004 Mercedes SLK32 AMG, which sports the same motor, especially when the Mercedes cost several thousand dollars more.
The specs for the SRT-6 were found to match the 2004 SLK32 AMG at 349 hp and 332 ft-lbs of torque. That power was delivered by an AMG hand-tuned, supercharged version of the standard 3.2 liter V6.
The SRT-6 also featured a stiffened suspension,
larger brakes, a fixed rear wing, and designer alloy wheels. Other small details differentiated the SRT-6 from the other trim levels, such as SRT badges and SRT logo embroidered
suede/leather seats
& custom front end.
The SRT-6 was mainly produced in 2005, with approximately 3000 of them coming off Karmann's production line in Osnabrueck Germany.
(2016 Coupes & 938 Roadsters.) The 2005 SRT-6's were available in Aero Blue Pearl Coat, Black, Graphite Metallic, and Sapphire Silver Blue. There were only three options available on the SRT-6: color, tires and nav system. A buyer could chose between high performance (summer) tires and all season radials. Also they had a choice of standard audio system, or the audio system with built-in GPS navigation.
A very limited number of SRT-6's were sold as 2006 models. Only twelve 2006 SRT-6's are believed to exist, but that number is unconfirmed. It is believed that these were special production cars some with specialty paint, and were not intended to be sold. Some of the 2006 SRT's are known to be Chrysler company cars used for testing, promotions, reviews, and marketing purposes.
One is known to have been in Auburn Hills, MI for marketing use - taken to shows, driven by magazine columnists, etc." Chris (a seller on eBay)
(Not my words {except in the blue}, but I agree with the above info & think it is a Good brief summary for the Newbies.) 
SF