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K&N's Air Intake Systems Offer Guaranteed Power Gains for Harley Milwaukee-Eight

Harley Milwaukee-Eight engine view

The new Harley Milwaukee-Eight engine benefits from the 63-1138 intake (Photo H-D)

Change comes deliberately for a venerable, tradition-based company like Harley-Davidson®. You have to tread lightly with a customer base that so values history and familiarity. Harley riders claim their engine allegiance like badges of honor. Knucklehead, Panhead, Shovelhead, Evolution, and Twin Cam have become an indelible part of the motorcycling lexicon.

In just its third all-new big twin in 80 years, Harley has unleashed the exciting new Milwaukee-Eight. As Alex Bozmoski, Harley’s Chief Engineer of New Products puts it, “It’s a brand-new motor, tip to tail.” The “Eight” in the new engine’s title indicates the utilization of 8 valves. Interestingly, the octet of valves is actually reminiscent of the power-train of the Harley board track racers of the company’s early years.

To get the most out of the new 107 CI Milwaukee-Eight engine technology that powers much of the 2017 Harley FL line, K&N has developed the K&N 63-1138 air intake. The 63-1138 is designed to enhance the visceral riding experience in a very exciting way. The intake is designed to improve throttle response with a significant increase in clean airflow to the new engine.

The 63-1138C chrome intake for the Milwaukee-Eight engine

The chrome version of the 63-1138C intake gleams with K&N technology

That’s not just a hollow claim – it’s a promise. The 63-1138 intake carries the K&N guarantee to increase the horsepower delivered by the Milwaukee-Eight engine. As an example, K&N’s strict and rigorous testing showed an estimated horsepower gain of almost 6 horsepower and over 7 foot-pounds of torque in an otherwise stock 2017 Harley-Davidson Road Glide with the Milwaukee-Eight 107 CI engine.

In keeping with that visceral riding enhancement theme, the 63-1138 emits an aggressive and satisfying engine growl. When running the 63-1138 the deep breathing Milwaukee-Eight’s intake sound is unleashed.

The performance enhancement that the 63-1138 offers up for the Milwaukee-Eight engine is a direct result of careful engineering. The intake starts with a special billet aluminum throttle-body mounting plate that attaches to a mandrel bent aluminum intake tube.

The 63-1138 black intake for the Milwaukee-Eight engine

The 63-1138 presents a subtle and mean black look to the Harley FL Series

That free air passageway is capped off with a high flow K&N filter. Multiple layers of cotton gauze filter media are formed into a pleated conical filter element that flows significantly more air than the stock intake.

K&N knows you want your Harley fully protected from the ravages of the road. K&N’s oil-impregnated filter media has been proven over 4 decades of real world testing. Not only will your Milwaukee-Eight engine breathe freely, it will also breathe clean.

The intake comes pre-oiled and ready for a simple, straightforward installation on your Harley FL model. When it is time to clean the element, that process is easily accomplished with a K&N recharge kit like the 99-5000. For added protection and a unique look, the filter element can be dressed in the RC-3680DK filter wrap.

The intake comes in two distinct finishes to complement your Harley’s styling. The 63-1138 is powder-coated in an aggressive black finish. While the 63-1138C features a gleaming chrome finish.

The 63-1138 black intake for the Milwaukee-Eight engine parts view

Everything that is needed for easy installation is included in the 63-1138 kit

The K&N 63-1138 and 63-1138C are designed to fit the following bikes:

2017 HARLEY DAVIDSON FLTRXS ROAD GLIDE SPECIAL 107 CI - All Models
2017 HARLEY DAVIDSON FLTRX ROAD GLIDE 107 CI - All Models
2017 HARLEY DAVIDSON FLTRU ROAD GLIDE ULTRA 107 CI - All Models
2017 HARLEY DAVIDSON FLRT FREEWHEELER 107 CI - All Models
2017 HARLEY DAVIDSON FLHXS STREET GLIDE SPECIAL 107 CI - All Models
2017 HARLEY DAVIDSON FLHX STREET GLIDE 107 CI - All Models
2017 HARLEY DAVIDSON FLHTKL ULTRA LIMITED LOW 107 CI – All


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