It is recommended to replace when rebuilding or swapping in your motor to prolong engine life and ensures proper water flow and cooling for your motor.
The S14/15 SR20DET water pump is also considered an "upgrade" for S13 SR20DET motors due to the fact of redesigned pump for better flow. It bolts up the same on the S13 SR20DET, but does not use one mounting hole that the S14/5 has. Many have done this small upgrade and their s13 SR20DET engines are running fine without leaks.
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