I am planning a return to the track for the 2010 season after a multi-year absence. I've read through the 2009 GCR and haven't noticed any prep changes since I last raced, but I suspect there are some changes that I just haven't noticed.

Can anyone advise a reasonable way to compare GCR IT prep rules from when I last was paying attention (2004 season) though the current set? Any way to generate a "changebar" document back to 2004? Perhaps annual changebar'd versions of the GCR are archived somwhere (so I could easily catch changes made in 2005, then those made in 2006, etc.)? Or perhaps there are few enough changes that someone has been keeping track of important changes year by year to help us ensure we pass our annuals?

Thanks for whatever you can provide,
Steve
'83 RX7 - IT7 - Atlanta