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open downpipe
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  1. MKVI GTI
    hey guys, im running a 2.5" forge open downpipe on my mk4 and i was wondering if i'd gain or lose hp/ torque? i feel like my torque is a lot lower now but not sure about the hp gain and wanted to know if an open downpipe will ruin anything or not, plan on running it open for awhile. responses...
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