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Bootmod 3 is an actual flash, to be simple, it reprograms the car to make more boost. Jb4 on the other plugs into sensors and FOOLS the car to make more power. Bootmod3 will have better control of fuel trims and air/fuel ratio compared to Jb4. That said I am a newbie at tuning and dont know how to explain it better than that. I have a JB4 on my car and it runs great, I also am looking to sell it (I have n20 ewg jb4), as im looking to trade my car in for a 440i.
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