I have just bought a 97 GTX that just had the motor rebuilt has 150psi in both and have just replaced the jetpump with one from a 96 XP that had about 40hrs on it and looked pristine. I have also replaced the Rave Valves with some that were in much better condition and have the red screws bottomed out. I figure it is a heavy Ski and I will be hauling the wife around so it could use the help out of the hole but would like to know how much will I loose on the top end for when I'm out on my own. if it will still get close to 55 I will be happy. its really very easy to change those adjustment so maybe I'll just change them whenever the situation changes.