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audi s4 valvetronic
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  1. Audi
    Client's Audi S4 V6T fitted with Armytrix F1 Ver. Cat-back Valvetronic Exhaust System Valve open: Extremely loud race mode Valve close: Quiet Stock mode Auto RPM mode: Better launch start @ low rpm & Performance gain @ mid-high rpm Official website: www.armytrix.com Quick Inquiry...
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