90 B2200 CAT ??s

My truck ia a 90 B2200 w/Carb, Automatic, 200K miles -- I have a couple of questions:
1) This truck has two catalytic converters - one just below the exhaust manifold and one under the truck in front of the muffler. I believe both are the original converter. The truck has lost power and I can hear the front converter rattle when accelerating. So I guess it is time to replace it ( them ). Do I need to replace both converters?? or can I get just one "universal" type converter. Also, why does the truck use two converters?? Is there a difference in the catalyst inside ??

2) When looking down at the bottom of the radiator from the front of the truck you can see the cooling lines for the transmission. Which line is the return line to the transmission?? The left or right line ?? I am thinking of adding a transmission cooler.

Thanks

Mazda's were VERY choked down with emissions devices , they used two converters to attempt to keep all the emissions down that they could , if you would like to restore some power , and the laws where you live will allow it. Go to a decent exhaust shop and they can put straight pipe in the place of them , or redo your exhaust and eliminate them both. If you have to have them in there , Visit your parts store and they can supply you with a cheeper version of the factory one that might take a little work to get to fit but will cut the costs often in half.

As to your #2 ill have to look into it for you when im at work and see , i * believe * the upper one is the return but dont know for sure.


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Wollf