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2015 sl slingshot mods: fyi

  1. Polaris Slingshot Engine and Performance
    I started with a Cold Air Induction from Alpha. Claimed 10hp without a tune. That is noticeable seat of the pants feel. You feel alot of air being sucked in, but need the Cat. Delete Pipe or an exhaust system to let it out. So I added a Catalytic Converter Delete Pipe. (took off the...