hmm... first thing is to bring the car totally up to date on maintenance. then you can have a reliable driver.
upgrades? sky and $$ is the limit.
I run my 951 mostly at DE and limited street driving so I may not be a good source of suggestions for you.
check out Raymond's project....
http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/834244-86-944-street-racer-part-time-track-day-project.html
enjoy.
now if I can just get my 78 930 done.... someday... someday...
__________________
Bob Cox
78 930 clone project car.
87 924S resurrect at some point.
84 928S, Ruby Red linen/brown interior - sold 
86 944 turbo my new DE/track car - sold
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