or to keep your NA. 90 vs 91 isn't a big deal IMO. I've had both years. The differences you'll notice will be: nose panel on 91 has Nissan "hamburger" while 90 nose panel is blank the 90 doesn't have any airbags, so that's different along with a different steering wheel (I like the 90 steering wheel better) the climate control is different. the 91 doesn't show ambient temp, while the 90 does. but the 90 can't select the fan position which 91 can, I liked the 91's system better. All else is pretty much the same, aside from the obvious additions the TT has tha an NA doesn't. Go TT!!!!