I own a miata, and have been waiting a tall final drive ring and pinion for a long time
This is a 3.3:1 for the R180 diff
If you are interested in making your miata, first or second gen rx7, or s2000 (probably others) into a supermiler, this is the hot setup. My stock ratio is 4.3:1 !!
Anyway, I'm not associated with the seller but I do want to see this group buy succeed. if it does not, I will be stuck paying the same amount for a 3.636:1.
If you are interested, please check it out. RWD FE rules
http://miataroadster.com/33rap.html
Matt