hello i have read the sticky on 400ex jetting but i have more mods then what he has is for mostly stock and idk what pm is im new to the site but

i got a 01 400ex with a 440cc big bore kit full big gun exhaust and big gun rev limiter its a stock cam though i think it has stock jetting its running super lean but also doesn’t seem to be getting power in the mid to top end rev of the motor anybody have any suggestion also i am gonna buy a air filter any suggestion on which brand k&n, Uni filter <honda oem and i am gonna get a stage 1 hotcam can i get info on what to run with the filter and hotcam and with out ?? i am just looking for any info or suggestions