Modifying the chips (software) was never my thing. Back in the day I had a friend who had a 1987 Buick Grand National (very fast car from the factory) and he was able to get a lot more horsepower from the engine by modifying the software. I think it's a pretty common thing now days but again, I've never done it.
As far as scanning tools go....Snapon makes some good ones. It all depends on how much money you want to spend. I'm cheap so I would look on Ebay. They can get VERY expensive.
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