Zrider, it's not that dificult to remove the radiator and fan. I think it's about 6 - 8 bolts or so. It makes it much easier to remove and install a header pipe. Just clamp off the radiator hoses and you won't lose much coolant. It's much easier than it looks.
If you take off the piece that attaches the radiator hose to the engine block (the thermostat is located there)and unscrew the 3 bolts that attach the radiator to the frame you should be able to pull the radiator to the side (the right side) and keep it out of the way.
That's what I did to remove the stock header. I didn't lose much coolant either.
Remove the 3 bolts that hold the radiator to the frame, this should give you enough room to move the radiator around and allow you to remove the stockpipe and to install the aftermarket pipe. No loss of Coolant, no mess, and is quicker than a Hacksaw.
I tried to remove the stock pipe without removing anything but I couldn't manage it.
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