Front and rear complete subframes are for sale, not too far from me.
From what I understand the rear isn't worth it since you lose the ability to easily add a rear subframe brace. But the lower arms/hubs on the NA subframe will give you a more mm of track width?
The front I know has better geometry for the steering.............but is it enough to REALLY be worth the effort?
I'm trying to prevent myself from going overboard building it before I even get it to its first HPDE!
What year is the tub? If it's 1994 or newer, the NB rear won't affect your ability to install a rear subframe brace. If it's older than that, you will have to show some creativity in bolting the front of the brace to the floor.
The NB would give you an extra 5 mm of track width per side in the rear, and it comes from the uprights. You can mix and match those if you do/don't want it. Front track is the same.
Worth it? I did it on the Targa car because I was building from scratch. On a complete NA, I probably wouldn't bother.
It's on a '90.
I think the subframes are off a 2002. I thought of building the entire front subframe with new bushes/hubs and everything then bolting it up, but wasn't sure it was worth it.
Thanks for confirming!
you would also need the steering rack iirc
You need the steering rack and ideally the front uprights, which also means you need the front upper control arms.
Yeah, the subframes are COMPLETE. Down to the springs/struts/mounts, steering rack, etc.
Tempting. That will get you a larger brake package as well, and the later rear subframe bracing is good stuff.
Curious, how well do the small brakes on early Miatas stand up to track use? Any issues with fade?
Depends on the pads, the track, the power level and the driver.
I swapped in 1.8 NA caliper brackets, but retained my oe calipers, and rotors on my 91. ProSlot rotors and Hawk pads. They are very good now.
I'm betting you changed your rotors at the same time.
I already picked up a set of NB sport calipers and brackets 
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