i had a cobra f1s slip-on on my 89 gs500 it sounded great and it cleared up the flat spot in the powercurve on the bottom end..
http://www.cobrausa.com/atv/index_atv.cfm?pg=ex&catID=8&subCatID=24&manID=4
http://www.cobrausa.com/atv/index_atv.cfm?pg=ex&catID=8&subCatID=22&manID=4
-jeffro
http://www.cobrausa.com/atv/index_atv.cfm?pg=ex&catID=8&subCatID=24&manID=4
http://www.cobrausa.com/atv/index_atv.cfm?pg=ex&catID=8&subCatID=22&manID=4
-jeffro