The specs for the rear are -2.2 being the max and I am at -2.2 on the drivers side and -2.3 on the passengers side.
I have not noticed any tread life problems and have had a set of RE11s on there for the last 11K miles. Surprisingly have lots of tread life left which was a shocker as I have heard that these tires don't last long...
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Powertrain Warranty voided on 5/14/2011
Mod List:GTM Supercharger,SmartTop module, Oil Cooler, GT-R Start button, Nismo Exhaust, BC Racing ER Coilovers, Backup Camara
For eastwest: 
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