I saw [link=http://rcglowplugs.blogspot.com/2007/12/xray-releases-official-xb8-mud-scraper.html]XRAY released a set of mud scrapers[/link] that go inside the inner wheels. They are supposed to make the XB8 jump better since mud won't be able to accumulate inside of the wheels. Is anyone using these? If so, do they make a big difference?