As per your other post asking about adding a turbo to your 2: my reponse is still the same: don’t bother. Just buy a faster car. It’ll just be an expensive lesson in how to break your fuel-efficient little grocery getter.
Source: modifying underdog Mazdas to barely outperform non-performance cars followed by wearing the car out prematurely. Repeatedly.
AutoEXE is definitely a Japanese parts company with strong ties to Mazda. As others have said: RE-Amemiya for rotary goodies. I think Knightsports is Japanese, they do have parts for Mazdas, but i don’t think that’s exclusive.
If you are okay with broadening to non-Japanese only aftermarket companies that do Mazda parts, your options open quite a bit.
AWR are awesome.
Roasts my toes in my 2!