Stock '04 WR450F

I have a '04 WR450, completely stock. I just got it and don't want to get to crazy with mods/additions yet - I've been out of the dirt for a while and need to crawl before I run. I would like to open up the breathing some though and was thinking about cutting out the air box indentions and adding a GYT-R Performance Insert to the pipe. Any thoughts from the more experienced out there? Any jetting recommendations if I follow this route?

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