There is a recall on the cats http://www.alldata.com/TSB/19/971941C8.html you should call a dealer and see if your car has had it done or make a post in here asking for an oasis report.
98.5 SVT#6092 of 6535 B/MNB Born on date 5/22/98 Y2K Suzuki GSXR 750 Y/B with 140.6HP
