I have an 05 Specialized Enduro pro - it came with a 5th Element Air - it died within 2 months, piece of crap. I just got the 06 DHX air. In the manual there is a "boost" setting adjustment - a shrader valve on the end of the piggyback resivor. Mine does not have this, there is a little white plastic piece instead. I'm sure it is that way because there would be a clearance issue if the valve was there. My question is can I adjust this "boost" setting - and how? - thanks in advance.