[snakeeyes]

I think there was a discussion of this subject in a fair amount of detail a while back. I recall the gist of it was that the X-stream was beneficial if you were running without a hood scoop, or running with a "sealed chamber" hood scoop, but if you were just running an open scoop like a lot of us that it could actually create a lean condition. I may be wrong but that's my recollection; you can probably find the discussion by doing a search. At any rate, I moved my X-stream lid to my Lister, which has clearance issues requiring a 2" high filter element and does not have a scoop--