Just found this
That top one is indeed an R from looking at the pictures.. Very similar to my old NA1-R.
NA1-R was made in 1992-1995.
NA2-R from 2002-2005.
They come in various colours including green, blue, red, yellow and white.
Here's another green one:
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Seats came in red or black - carbon kevlar shell with electic motors for front-back movement. No recline.
Passenger seat came either fixed or electic.
NSX-R didn't have PAS and had a different ABS system to a normal NSX.
NA2-R ABS was revised even more than NA1-R over NA1.
Steering wheel was a 350mm Momo on a telescopic type boss for optimum driving position. Gear change system was completely different to Coupe model with a titanium shift knob. The NA1-R shift knob was chosen by Senna himself
Weight reduction was severe with a lot of sound deadening removed, thinner glass, reduced weight engine cover, lighter wheels, lighter calipers etc.
The chassis is tighter and NSX-R uses Showa built suspension. NA1-R is harder than NA2-R. Something that surely helped the NA2-R under 8mins round the Ring.
NA1-R is just so firm
NSX-R engines were blueprinted, a lighter flywheel was also used out of the factory but a normal NSX clutch/flywheel is now used for NA1-R replacements. The gearing on the 'R is closer than a JDM and EUDM coupe. I prefered the Mugen gearset/LSD/4.4 final drive to the normal NSX-R gearsets.
No amount of write-ups can explain how an NSX-R feels to drive, a lot of people will never get the NSX-R thing and the NSX has always been overlooked by Skyline/Supra/RX7 owners as it was "tune-able". NA1's can be tuned to around 300bhp fairly easily. The NSX-R was always about the performance envelope, not bhp figures.