This site has pipes for that engine It will incrse your power a little bit
http://www.aaenperformance.com/Polaris.asp
1998 Polaris Indy 500 chassis with 98 Xc 600 motor
SLP ceramic coated pipe with SLP can
V-force reeds
4 inch pivot riser
Gutted Air Box
EPI clutch kit soon to be installed
Maybe some pro tapers
1998 XC 700 water-cross sled
SLP twin pipes
Some light weight parts
Water-cross mods include taking the parts u do not need
This includes removing the seat replacing gas tank and IFS bars.