Tommy Tucker

Was wondering what mods are most likely to affect emissions...good or bad.
I know that reducing the cam lsa will be a big -ve but what about static compression ratio? Anything else?
I'm thinking that raising the CR would reduce emissions due to the increased efficiency. Is this generally the case?
If anyone has failed an emissions test, what strategy did you use to get it through?
Not failed yet, but I hear the hotcam has trouble sometimes.

Tom.