I finally figured out why my wife's GTX is faster than mine. I looked underneath and the wear ring has a gouge all around the front part of it. Looks like something got stuck in there and wore out the ring. The impeller appears to be okay. I'm going to have to replace it. I'm very mechanically inclined, so it shouldn't be a problem replacing the wear ring. However, I have never played with water craft. What all do I need to replace the wear ring? Jet pump alignment tool, pullers, etc. Also, if you recommend replacing the impeller...which one offers better performance.