Hey, I'm in CBus too (well, Delaware actually). I raced ITC for years but never personally raced an '88-91 ITC Civic, but I know several guys who have or still do. I'm sure I could easily put you in contact with some of those guys.
I don't think any one year is more desirable than the others, but I could be wrong. You can't go wrong with a Koni/Ground Control/Eibach combo. You shouldn't need to do anything really trick for your exhaust (at least right now) and could easily just go with a DC Sports. Actually, you can find really cheap brand new D-series headers on eBay. They're not going to give you the absolute greatest numbers ever, but they're really not that bad at all. My roommate seriously had a header on his ITA CRX that he bought brand new on eBay for about $20, shipped to his door.
Kevin
2010 FP Runoffs & Super Sweep Champion
2010 ITB ARRC Champion
2008 & 2009 ITA ARRC Champion
'90 FP Acura Integra RS
'92 ITA Acura Integra RS
'92 ITB Honda Civic DX
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