Re: Changes from year to year?
I believe the limited vs the base package became available in 2005.
07-08 have a dead pedal for the MT6. The user manual comes in a pretty case on the newer cars. In 2005, purchase of a new Crossfire got you a set of free Crossfire luggage.
In 2005 they offered the AMG-built SRT6, auto tranny only.
In 2006, some of the n/a packages came with the SRT6 wheels for no apparent reason.
Get the picture -- very little, no zero, product development over 5 years. Basically re-skin a reliable but underpowered SLK320 and sell it for less than the SLK320/350.