I will probably go with a complete set of lightweight aftermarket A arms, so not overly worried there.
From what Ive gathered so far, most of the changes were up front and aftermarket subframes are modeled after the NB geometry anyway.
Rear suspension seems to be mostly the same.
Aero is pretty close after a wing and a splitter.
Only big differences are the ABS (which Im researching now)
Fuel system is different too: NA is a return system where NB is a returnless (like the K series)
So the NB has many advantages:
Slightly better aero
Also some disadvantages:
More expensive to start
Fuel system is harder to modify later
Inexpensive to start
More complex conversion
Needs a fair bit more work
Not as good aero (some of which gets negeted by more power and aero development)
Thats what I got so far....
*edit* as per Andrews post, I will investigate the differences in hubs and spindles as well.
Originally Posted by Midtenn
The front upper control arms are dimensionaly the same, but the NB control arms have more gusseting on the lower side compared to the NAs. It actually changed at least three times between 90-05 from what I've seen. NA6 had the least (mostly around the bushing tubes), NA8 got a little more (extending away from the bushing tubes), and NB got even more (out towards the middle of the control arm).