What is the diameter of this intake and what is the diameter of air filter mouth is required?
Diameter is 2.5", and the filter is a 3.0" filter.
If this is my one and only modification, will I be OK using the stock fuel pump or should I upgrade?
You should be ok with the stock fuel system. There are lots of guys that run your exact set up with no problems. However, I will always recommend getting the fuel pump internals, as it's a great safety net against a blown motor.
Is this a 3.5" or 3" MAF housing?
This will be stock diameter.
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