I didn't realize you already had the 3.55 gears. I say go for the cylinder deactivation if you feel you are up to it. It sounds like you have the skill set needed, and what a feeling of accomplishment it would give you to finish it and have it work.
SlideWRX has a good point about the OEMs under-utilizing it. They have to be very conservative to prevent the owners from thinking something is wrong with the engine, whereas an ecomodder is much more forgiving.
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