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  1. Back firing issues... any ideas?

    Polaris Slingshot Problems and Issues
    Ive done all the standard upgrades... Injen Cold Air, 1320 V2 Header, 1320 V2 Exhaust with extra quiet baffle and DDM fuel rail... I plan on having the MEFI tune done as well. My question is, as soon as I installed the V2 Exhaust, I started having backfiring on the decel... with the extra quiet...
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