Cobb AccessPort V3 - 2009 - 2014 GT-R

This is the first modification any GT-R owner should make to their car.  This device unlocks the full potential of the car, even in stock form and allows you to modify the car and tune for the changes.
 
The Accessport is the world's best selling, most flexible, and easiest to use ECU upgrade solution for your GT-R. Unlock power hidden within the vehicle by replacing conservative factory settings with more aggressive calibrations. Follow our staged upgrade path with pre-loaded Off The Shelf (OTS) maps or use custom mapping for any modification level. It's the last engine management solution you'll ever need.
 
TCM Flashing Option
Adding on this option allows the AccessPort to be able to flash the Transmission Control Module (TCM).  This allows custom TCM calibrations that can improve shift points dramatatic as well as improvement of shift feel and pressures.  This is recommended but not required for simply tuning the ECU.  This cannot be added on later as it is part of the AccessPort itself.