racing on dirt

this is my first post and i need a bit of help with my micra 1.0 box shape

i want to make it a tiny bit faster but the mods cant be visible.

ive seen from some other micras that the airbox is drilled (the scrutineers allow this) to let more air in but does this help? because i am racing on dirt and its dusty, i would also like to know if any parts from the 1.2 engine will fit like the carb or the head because im not to hot on micras as this is my first one. is there anything simple that could be done to the standard carb.

i no this post is very boring but i will apreciate any help thankyou (Y)
 
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