There isn't any lean problems on the street unless you set the ME-R up to do that.
Usually they are on the rich side to start out with.
As time went on, like anything else it has evolved.
Mike's MAFT pro will probably work with the regular ME and you can use it with or without a maf. Never tried it tho.
OR...a lady I know has a new, never used factory maf for 200.
Steve