The answer to the question is: not likely.
You said "without" spending 10k in performance mods and "without" NOS.
Take those 2 out of the equation, and you'll be lucky to run mid-13's, let alone 12's on an early 90's NSX. On a 97+ NSX, different story.
Stock 91-92 NSX's were qaurtered by Motor Trend, Road and Track and other various magazines... the times were in the 13.6/13.7 range.
When my NSX was bone stock (I have a 92) I was able to consistantly run 13.6 to 13.8 on the quarter mile.
The last time I took my car to the drags, I pulled a 12.8 on 18x10 street tires, with just short gears, clutch, 4:55 R&P, lighter flywheel, exhaust, and NOS. (Did I hit $10K yet?)
The car is a lot more modified now, but I have yet to take it for a quarter mile run.
I know how to drive my car pretty well... but I couldn't break 12.8 that day with what I had back then, I spent far too much time spinning wheels, instead of moving forward
![Stick out tongue :P :P](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f61b.png)
I ran 10 times that day, using different RPM's at launch and different launch techniques, still no luck past 12.8.
Today with whats on the car, Im sure Id do much better.
-B