I think I read somewhere that the pipe from the carb to the airbox needs to expand 30% per foot or something like that in order not to be restrictive to the intake tract. Thats why the BBR U turn thingy gets bigger as it gets closer to the filter. Ask Dood.
looks good, not trying to hijack but im going to ask im picking up an x4 in the next week never owned a pitbike I ride big bikes how do I oil the uni filter like a big bike filter???? they are so open it seems like they will suck dirt so fast!