I was looking around my engine today, and found a stamp on the side of my intercooler.
"Toyo Radiator
N3A1 714059"
I can't find a reference to it anywhere on the web. It looks completely stock, and its in the stock location, so I figure toyo manufactured the stock intercooler. Anybody have any ideas?

 

Yep.

 

I think the one in my 93 touring was a Denso.

 

On my stock 93 touring the air intercooler is Hitachi

 

Oh well, Mazda must have had several different suppliers for their ICs. The only one I've ever seen out of the car had "Toyo" on it as you mentioned and it came out a '93.

 

Actually, Denso may have been the radiator and not the IC. My memory may be decieving me.

 

denso make both coolers and radiators amongst other things.