Look on the driver's door for RPO codes:
-GU4 3.08's
-GU5 3.23's
-GU6 3.42's
Later.
Kevin
------------------
1998 Black Z28 A4
-------1/8-------
8.584 @ 83.64 MPH
Taylor 10.4mm wires,!EGR,!FRA,SLP Lid,MAF Ends,IAT Tricker,TB Bypass,Manual Fan Switch,and Dynomax Cat-back
BMR STB and Sub-frame Connectors
Pics