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SF Intake Testing - WRX/STi

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SF Intake Air Box Testing

We’ve had a few requests for us to post data regarding some testing we’ve performed on our SF Intake Air Box for the Subaru WRX/STI. I think the results state pretty clearly how much an air box helps with keeping Intake Air Temps in check.

Highway Driving:
COBB SF Intake no box: Max 124 degrees F Avg. 91.6 degrees F
COBB SF Intake w/ box: Max 108 degrees F Avg. 74.9 degrees F
Difference of: Max ~16 degrees F Avg. ~16.7 degees F

City Driving:
COBB SF Intake no box: Max 149 degrees F, Avg. 117.4 degrees F
COBB SF Intake w/ box: Max 111 degrees F, Avg. 87.5 degrees F
Difference of: Max ~38 degrees F, Avg. ~29.9 degrees F

Idle (~5 mins):
COBB SF Intake no box: Max 149 degrees F, Avg. 133.5 degrees F
COBB SF Intake w/ box: Max 113 degrees F, Avg. 99.2 degrees F
Difference of: Max ~36 degrees F, Avg. ~34.3 degrees F

All measurements were taken from the factory IAT sensor located in the MAF sensor. This is exactly what your ECU uses to determine how much timing to pull, boost compensations to make, etc. Not to mention the basic fact that cooler air = more, reliable power.

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