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Lean burn is effectively outlawed in the U.S. as of 2005. It reduces carbon emissions, but drastically increases nitride emissions. The First Generation Honda Insight was an Ultra-Low Emissions Vehicle (with a manual transmission), but when the EPA changed the standards it was too dirty to sell. A few users have made their cars burn lean, but that sounds incredibly difficult.
I have lean burn on my Civic and as much as I enjoy getting better fuel economy at 65 than 55, I am not sure I would ever modify a car for lean burn.
The major production vehicles to have lean burn are the old CRX HF, Civic VX and HX, and the first generation Insight, but never a model with an automatic\CVT.
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