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Ideal for those of you who need to upgrade the valve springs to sustain a more aggressive camshaft set
Maintains proper air/fuel ratios
Mild to moderate transmission gear noise
STI 2004+ / WRX 2002 - 2007) for the 2004-2021 Subaru STI is a direct-fit upgrade developed by Cobb Tuning as part of their comprehensive platform-specific lineup for the GD/GR/VA STI
AEM Dryflow Drop-In Air Filter - 2019-2021 Subaru STI PDM_brake-kits Ideal for those of youHIGHLIGHTS: Direct replacement for your OEM panel filter Flows better than the OEM filter Maintains optimal filtering capabilities AEM DryFlow Air Filter SPECS: Designed to increase horsepower and throttle response AEM air filters are cleanable and reusable for the life of your vehicle Captures up to 99% of harmful contaminants Outstanding performance even in dusty racing conditions Does not require oil Will not void vehicle warranty A HIGH
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