a friend mine has a 2002 400ex likes the quad ,but of course the 450r has him excited , he saw a piped 450 yammy beat my ds by a quad lenght or two and he's having 2nd thoughts about up grading . for the price of upgrading is their that much diff, i know ther is but its the same quad but with a 450 liquid cooled ithink. anyone upgraded from the 400ex to the 450r?