I just aquired a Br 600 blower and I have to say, so far I am prety impressed w it. Definitly does have some power, does like to drink alot too. My question is regarding the use of this thing in weather colder than the 15 degrees recomended by Stihl after the shutter valve position movement. These things are awesome for moving a few inches of snow. Is there any kind of a jetting change for this, or has EPA done away with any tuning possibilities already!? Thanx in advance.