High Flow intake system. Re-use stock air cleaner cover for stock looks. Includes a special backplate, internal velocity stack, built-in breathers, oversized air filter element and hardware. A K&N Dyno test of this RK-series air cleaner assembly on a 2008 Street Bob showed an increase of 6.54 HP@5100 RPM, a 2014 103″ Ultra produced an additional 8.33 HP@4670RPM. The K&N RK-Series air cleaner assemblies are truly stealthy air cleaners since the stock air cleaner cover is re-used. Power increase is realized by replacing the stock filter and backplate. A special K&N powder coated aluminum backplate, with Dyno-tuned velocity stack, is required to house the oversized K&N air cleaner element. Built-in breathers replace the stock external breathers. Careful design made it possible to re-fit the stock air cleaner cover for a stock un-touched look.
- Category: Aircleaner assemblies
- Manufacturer part number: RK-3942
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