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I know the G5 has better isolated boost control, so if you plan on going into the 15-18psi range, i would go with the G5, assuming you have all other bolt ons already.
Thats not to say that the RBs wont still out perform the stock turbos on Map2, you might get better breathing in the upper end of the rev range, so more power potential.
Is there any reason you arent going with an Access Port over the JB? Unit to unit alone, the JB probably makes more power, but if you get your car tuned with the AP by a 3rd party tuner, you can make really really nice, smooth power.
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