How to make a Seadoo GTX faster and runs better?

I have a 1996 Seadoo GTX and it runs great and starts good. I run seafoam through it and good gas and Quicksilver PWC oil. Is there anything else I can do to make it faster and without messing it up?Also is there any tips on making it last long and stay reliable?|||put new plugs in it and get a new impeller and ride plate and even a intake grate would help. grease the drive shaft about every 4 or 5 times it is in the water. it will make a big difference in the ride with ride plate and the grate.|||idk my bff jill