The 04 was the first year. A few differences here and their. Not in body styling, only in a few features. The 04 actually had a auto dimming mirror. Newer ones didn't. I think Knee protection in newer models were a little different. LED radios were in the oldest 04's and were hard to see in daylight. LCD's went into later ones. I changed my LED out with a Factory LCD. Much improved.

I'm not sure how much they did in changing out or updating / upgrading parts from year to year. The tranny connector / seals may have been upgraded (common issue in the Crossfire - at least in the earlier models. The CPS issue ........not sure if they upgraded or not. Pretty sure it happens in almost any model year Crossfire.

That's about all I can think of off the top of my head. Car by car / case by case even in the case of the common issues.

Fun cars. Love mine.