Actually the 91 3.0 stock NSX runs:
5.03 sec 0-60 and 13.47 1/4mi
The Heavier 95 3.0 coupe as mentioned before is not a Type-R if it were it would have the Red Recaro seats and 5 Spoke Enkei-made wheels.
Leather and the 7 spoke OEM's are not available in type-R. Plus the magazine does not say type-r anywhere.
Then here is the even heavier NSX-T 3.0 doing 5.7 0-60http://www.nsxprime.com/FAQ/Media/magazines/1996-08-motorsport.htm
The confusion comes from the 91-94 3.0L non-powersteering early cars to the 95-96 3.0L Targa available cars. the targa was 200lbs heavier than 91-94 the 95-96 coupe was still 125lbs heavier than 91-94. thats why they uped the power in 1997 3.2L to accomodate the post 1995 Targa 3200lb frame.
so.. these are the corrected numbers
91-94 NSX 3.0L 5.03 sec 0-60 & 13.47 1/4
95-96 NSX 3.0L 5.4 sec 0-60 & 13.57 1/4
95-96 NSX-T 3.0L 5.7sec 0-60 & 13.7 1/4
Read all about it here...
Plus if you know anything up you know you can get any NSX coupe into the 4.5 sec 0-60 range and 12sec 1/4s with $5k in bolt-ons and run 200k miles with no issues. NSX is Non-Turbo because it is road race ready thats damn fast for reliable NA power.