Hey guys you may already know this. However here it is, an article about tuning your C4 IRS and part up grades. The ones that caught my eye was the camber rod bracket relocation and the relocation brackets for your trailing arms. Parts by Doug Rippie.
Page 2 is good!
http://www.racecars360.com/Corvette_...uspension.html
Doug Rippie
http://dougrippie.com/?cat=20