2005 and 2006 are the only years they made the supercharged version of the crossfire which is called the srt6. There is two other version of the car called base and limited models which are the majority of the crossfires you see. The base and limited versions came with the naturally aspirated v6 that puts out 215 hp and the supercharged srt6 which puts out 330 hp. Also they did make srt6's in 2006 but very few were made, so they are very hard to find