Welcome on board - if you are new it is worth chatting to one of the tuners directly and getting advice - most on here use either Cobb or ECUTek - both tuning/programming devices which can be used to map the car and gearbox software.
Iain Litchfield is my choice but SVM in Birmingham, ACSpeedtech, Sly @ Kaizer all have excellent and long term customer service and tuning reputations within the GTR community.