Boost/Vacuum: -30 to 30 PSI - Carbon Fiber Mechanical Gauge (2 5/8") Zeitronix 2015-2020 Audi S3 for models
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Boost Vacuum: 30 to 30 PSI Carbon Fiber Mechanical Gauge (2 5 8") Zeitronix 2015 2020 Audi S3 for models 2015 2020 Audi S3 for models with the factory magnetic ride 25" Air Flow (cfm) 800