After getting back from Daytona, I noticed my SXR has been making a "whining" noise. It almost sounds like the impeller is making contact with the wear ring. I am assuming the SXR's pump is designed like the Yamaha's...could this noise mean I am going to need to replace the wear ring? I am guessing that it is prone to swelling just like the Yam's pump. I haven't noticed any measurable loss of power, and there is nothing rubbing against the impeller shaft that I can see. It wasn't making this noise before Daytona-any ideas?