I have an '04 CRF100F and am interested in maximizing the breathing of the stock setup - sort of like the famous Gordon's Mods for the XR400. I plan to do a Uni filter, open up the air filter cover with a 1" breathing hole behind the number plate, maybe grind the header flange if it looks necessary and either add some 1/4" breathing holes in the exhaust silencer or remove it entirely. Would you start off with 42/105 jets for this setup at sea level? Also, I am at 5,300 ft altitude. Do I use the correction factors as found for an XR400R carb? 0.95 correction for main and 0.90 correction for pilot? Thanks.