I have a 2001 WR426. I love it. Details: Full FMF exhaust Boysen accelerator pump YZ timing Jetted for higher altitude All the free mods have been done as well I met someone once with the same bike and he had a performance intake... manifold? It was between the carb and the head. Big donut thing. He explained it to me and how it reduces backflow in the head just before the valves. So is it worth the money? Where do I get one and what is it officially called? I'd really like to be able to wheelie in 3rd 4th and 5th.