The NSX-R GT was created by Honda solely to comply with the Super GT production-based race car homologation requirements. As JGTC rules required at least five production cars for any race car version to compete, the NSX-R GT was limited to a production run of only five cars. The NSX-R GT is guaranteed to be one of the most exclusive JDM rides with only five built with a price tag of about €350k ($450k) back in 2005. Because this NSX is so rare and in RHD there are quite some replica’s out there, including Spoon Sports kit.
The differences between the Second-Gen NSX-R and the NSX-R GT is the addition of a functional snorkel attached to the roof of the car, lowered suspension and widened body, more aggressive aerodynamic components such as an extended front spoiler lip and large rear diffuser. It also is speculated that the NSX-R GT incorporates more weight savings over the NSX-R. Honda never advertised what, if any, changes were made to the 3.2L DOHC V6 for the NSX-R GT.
Technically, there's not much difference from the normal NSX-R; it's powered by the same 280-horsepower, 3.2-liter V6. However, there are a few carbon-fiber parts, which guarantees better handling and down force with the GT.