My US spec 2/79 has the Catalytic converter heat shield mounting points. I thought that started in 1/79This are not my personal pictures but show the 1/79 routing of the exhaust except for markets with a CAT.
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Those markets the exhaust still went out side the frame just went under the frame on the 79 and 80 models. 81-83 it was above the frame like the rest of the world except it has a small EGR pipe. 8/80 a heat shield was added on the left foot well in the cowl. The CAT makes the exhaust run hotter. This is why it was run under the frame in 79 and 80. 81 model Toyota added the heat shield and moved it above the frame like the rest of the world. When the exhaust was run under the frame it blocked the routing fornthe PTO winch driveshaft. Even after 8/80 when Toyota routed all exhaust above the frame they never offered a PTO winch option in the US. I have sourced a couple non US market 8/80+ PTOs and driveshafts. Personally perfer the exhaust routed outside the frame. There is no skid plate for it but is higher than the frame. Two track trails the tire tracks have better clearance the the center. There the skid plates are lower than the frame. Routing exhaust above the skid plate added heat to the cab and transmission and transfer case. Toyota never added any type of heat skids in that area.