Read all the posts on this subject and agree that the dyno effort is well worth it...well but after one does it everyone can benefit!!!LOL...heres my take... first of all if your rhino has an elec. dash
it shows Kilos per Hour ...not Miles per hour...lets get this straight right from the start...just so we are on the same page...but for the sake of argument doesnt matter what its called...just that it improves..right?...
  ignition box...best 2 bills spent...goes from 41 to 46..with stock tires on the highway...flat..no hills....Jet kit...and K&N filter..stockairbox...
use the dyno jet kit...its made to work with the filter... use the 165 main jet...drill out air screw plug...turn it out 1 full turn...turn the idle down to less than 1000 rpms..very important because it will be very VERY hard to shift into gear if you dont..remove 3 allen screws from exhuast and with a small die cutter grind th weld that holds th spark arrester..you will be reusing it ..hack the inside of the pipe flush with th plate..before reinstalling the cap and spark arrester take a sharp crow bar 1 inch in dia. or similar and pound it through the 2 baffles keeping in mind that you want the holes to line up with head pipe..really unchokes it without making it ANY LOUDER..56.....remove the manifold and cut the runner
out from the floor..blend it into side walls in a line of sight type method..
yes remove it completly..leave rough cutter finish...dont try to make the manifold bigger.. 72...wow...that is with NO clutch mods and yes it will do 68 with ITP 14 in paddles on the sand hwy at glamis.. do yourself a favor
and relocate the fuel filter from behind the fuel pump and put it under the seat..just switch the hoses short for long...thats 72 on the pavement with only couple hours work..$270 in parts...remember if it goes faster at night its because its TOO rich in the daytime...4 strokes like to be very lean...
slight grayish bluish color on a plug check after taking it to oldsmobile hill and back...brown is too rich...jet for best speed...
thats all for now...I put 3000 kilos on my SE with this setup...all full thottle runs through the dunes... David S&M Fabrication