no airbox jetting question

[flattrack450]

i have a 450r to play with at the paducah national in two weeks. this thing is stock except for a slipon HMF. i was thinking to remove the airbox and run a straight filter setup, but i read over at trx450r.org that this motor/carb setup relies heavily on the vacuum of the box for it's low end punch.
what do you think? open it up?

anybody run a straight setup or with the lid off and a re-jet?

what suggestions can someone offer up for more power throughout without sacrifice to low, mid, or top end.

thanks
flattrack

[smorris]

Lid off airbox, bout a 180-185 main jet, raise the needle 1clip
lettr rrippppp!!!Should be really close for ya.The airbox lid kills this thing.Or talk to dynodn and make some real hp!Trust me he's making these things RUN!