Hi I dont have an EFI model (2009 AUS model), BUT I can tell you all the things kawa have done to restrict it..
1. Check the throttle cable where it connects to your throttle bodies, it's likely there is a screw that actually stops the butterfly from opening fully. Turn throttle and see if anything stops it premature (they did this to carb models).
2. Exhaust is very restrictive... I got powerbomb headers as well (they are bigger diameter and lighter)
3. Now check airbox inlet - chances are its a tiny inlet into the airbox. Many klx owners replace the stock snorkle with a kdx200 one, or just pull it out and cut a larger opening. This is mostly responsible for poor performance.
4. Remove backfire screen from behind airfilter
5. Last thing is fuelling (carb was easy - it needed a rejet), but EFI I have heard has issues becuase it is not very easily remapped. I could be wrong, google it...
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