So recently I installed my full system exhaust, removed the airbox (replaced with K&N pods) and removed the Kleen air system.
Re-jet is as follows:
Needle : clip in 3rd from top 2 washers above clip on top to hold.
Pilot: 40 (factory pro)
Main jet: 112 (factory pro)
Idle mixture screw: 3 turns out
I've yet to do a fresh dyno run with the pods installed and upgraded mains, but MAN is it more fun now.
When WOT at 13k rpm first gear (around 30-40mph) when shifting into second my lil ninjette actually does a small power wheelie (about a foot off the ground). It's wayyyyy fun in safe moderation. Other then that, there is significantly more pull all the way from 2-13k rpm. I dropped from about 50-55 MPG to around 45-50 MPG city ride but honestly don't mind.
I'm guessing peak HP will be around 31hp? Dealership told me it's unlikely it's over 30 since they've never dynoed a 250r over 30 but I think I might break it.