The SES light for overboost will come on at about 25 lbs. causing the PCM to decrease fuel delivery attempting to control the boost. This condition usually occurs in "chipped" vehicles. This Boost Relief Valve will relieve any excess pressure over 16 lbs. to the map sensor, while allowing the engine to receive full boost. No more SES light and full fuel delivery through all RPM and boost ranges.

The boost relief valve is installed in the line to the map sensor. This line is located on the passenger side of the engine compartment and runs over the intercooler tube right behind the oil fill tube. Make sure the arrow is pointing towards the map sensor.

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