Can I change the oil pump relief spring in the car?

For anyone wondering, that is not the radiator hose in a weird place, it's the turbo compressor discharge
 
I used a 5/8 crowfoot from the front, no sweat at all....two washers to raise the pressure a bit. Now it actually increases with RPM, and idles at about 35 when warm....I am fine with that.
 
5/8 square head plug. I had to grind my crowfoot that was a tubing type for hex, to get rid of the outer end tits, to allow him to slide in place.
 
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