Like stalker said, its a MAP hack that raises boost without fueling properly. Besides, a MBC or MBC+A gives you more power than a T5Boost 4 ever does and costs a whole lot less. Dyno's have proven a lean running condition with the T5Boost4. Save your money and go MBC, MBC+A or Modified ECU.
I agree with SPATL. I actually just picked up his MBC+a last week and the thing is amazing. I have it set at 12.5psi right now and its crazy how much power it feels like it has unlocked. Save the money and get the MBC+a!
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