Hay Brad you may not need those mods, Here are some other option I have a 95 model 200 you may save some money a long the way. Air box lid gone,boyesen reeds 2 stage, you can make the torque ring 1/4 thick, fmf pipe&silencer,set timeing if you want it to bark avance just a fraction past middle, or delay hit retard just a fraction past middle, I to was going to have head work ported and so on , HERES THE TICKET YOU MAY WANT TO LOOK INTO GO to power now web site and look at how it is made. I fabercated my own version a peice of stainless steel and J-B weld this past week I tell you man this thing really ROCK'S Had to ajust jetting a little 40 pilot 3/4 1 turn on air screw 150 main needle in middle clip, A little more over rev pulls harder out of turns, 3 gears wheelie Huge differents in torque, SAVE a ton of cash, Need it any way for the GNCC and Hairscrablems, I am long winded hope this tip helps you out BRAD.