Figure your up north somewhere since both tractors have gas engines.
The SU is a 70 or later model, good tractor but as said it's swept back axle design isn't the best for loader work.
A front mounted hyd pump can be installed but that design hasn't been made in several years, one would need to locate a complete loader with the pump and ALL of the brackets and components necessary to attach it to that tractor.
The 4000AP is a earlier 65-68 model with the smaller lower hp engine but otherwise a nice looking tractor.
I wouldn't mind having that cab to put on my 4500 for winter hay feeding.
Horizontal exhaust can be installed by simply swapping exhaust manifolds and acquiring the proper piping and muffler.
My thoughts on exhaust routing, I've had both.
Vertical exhaust sticks up and partly blocks your view, will hit low hanging objects and possibly damage the exhaust, once low hanging limbs and brush clear the muffler they'll swing back and slap the crap out of the operator.
Horizontal exhaust offers clear view and the operator is first to deal with low limbs and ect. Low hanging exhaust can easily be destroyed by stumps, large rocks or other objects one might run over or straddle with the tractor. If the exhaust tip is angled down it can blow up large amounts of dust, pointed straight back it will heat up the left side lift arm to finger blistering temps (personal experience).
Your also dealing with the exhaust fumes anytime you working behind the tractor or hooking up a piece of equipment.
I now run vertical exhaust with the pipe cut to same height as the top of my head, most times the exhaust will blow up and over me, any thing low enough to hang onto the muffler will also hit me, so it needs to be trimmed to elevated.
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