On my 08 KLR, remember I am at sea level. I put two #4 Stainless Steel washers, available from Lowes under the needle. Removed the welsh plug covering the air screw and set to 2.5 out from a light seat. Did the L mod to the air box. Total cost $1.45 for the five pack of washers and my KLR runs great from idle up. MPG is good also.
Iíve read, and talked with, a lot of people using the dyna jet kit that are getting no better performance than I got but, they may be faster due to the extra lightening of their pocket book.
Save your money, the above works great.