Was doing some research and found this dope site. I'm a pretty new Audi owner and read something about there being half years. If this is true is there a pretty easy way someone could please explain how I could tell which it is? I'd appreciate it and thanks either way. I thought it was a 05 S4 MT6 but maybe it's an 05.5?

 

halfway during the year audi would release new models or body styles. for example, if you have a newer body style 05 then you have the 05.5 audi. the B7 body style came out halfway through the year. another example my car is an 01.5 s4. same body style as the year before but they did slight engine improvements and new S logos.