Did you remove that big restrictive rubber snorkle out of the left side of the airbox? You can see it in the opening where air is pulled in. That also makes a big difference.
Thanks DX for mentioning this FREE mod that takes very few skills to complete. Plus the BaaWaaah factor is cool.
Phil doing the L mod (drilling the airbox) is a major difference and should be seriously studied before completing. Blu already had the biggest exhaust system installed and it does require more air.
-A stock KLR is already very lean from the factory. Completing the L mod will only make it leaner and that is not always good.
-Do the needle jet needle mod (.22 cent mod), and open the idle jet air screw to 2 to 2.5 turns before you do anything else.
-A Uni air filter is a plus for more than one reason.
-Remove the rubber air snorkle.
-Get it running well then start making decisions on other improvements.
I like to do 'one improvement at a time' if I can. This allows you to discover the plus's and minus's of your improvement.
Read, read, read and attend Tech Days if possible. TD's are fun and you have the opportunity to learn a lot about the KLR.