Improving The (2008+) Subaru WRX/STi Intake

The “velocity stack” that was used in the 02-07 WRX airbox mod can also be used in the 08+ WRX/STI.
airbox mod

The test vehicle (09 STI) also had the AEM dryflow panel filter
HP and TQ
2009 STi Stg2 Intake mod compare 811325

Boost and AFR
2009 STi Stg2 airbox mod Boost AFR 811325

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