are you sure you need an external cooler?
The stock line goes through your rad to heat your transmission fluid.If you are not racing and don't have a hi stall converter you probably don't need one.
All of the above. I don't know about inside the fenderwell (flying rocks?).
I always mount the extra cooler as far away from the rad as possible. I have mine running thru the rad first, then the cooler and back to the trans.
