^^What vipor said about the COBB unit being in valet mode to limit RPM's. I do not know what nissan would think of that either. My suggestion being, if you can somehow find a way to work up a relationship with a certain tech at a dealer and have him be the only one who works on the car you may find that the care taken of your car will be personal to that tech since you have now built a relationship, otherwise I would try doing most of the work myself.
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2010 Ford 6.4L Power Stroke Diesel: 588whp/1082wtrq
2007 Dodge 6.7L Cummins Diesel: 788whp/1405wtrq, runs 12's @ 7400lbs, Still miss my 370z!
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