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In response to the OP initial question, the differences between the 2 tunes are quite simple.
They both make similar power, so the things that matter are price and installation.
1) JB4 is cheaper but more difficult to install. have to get your hands dirty in the engine bay.
2) Cobb is more expensive but flashing is done from the driver's seat and so no turning wrenches or getting your hands dirty.
If your not going to go crazy modifying, then nothing else really matters.
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