For Harley-Davidson riders who demand both performance and style, the Ramjet Hi-Flow Air Cleaner System (price: $549.99 – $599.99) is a premium bolt-on upgrade engineered to deliver serious horsepower gains while elevating the aesthetic of your Milwaukee-Eight engine. Developed by Ramjet Racing—a trusted name in high-performance V-twin parts—this U.S.-made air cleaner is precision-machined, thoughtfully designed, and built to perform under pressure.

At the heart of the system is Ramjet’s proprietary one-piece billet aluminum backing plate, CNC-machined from 6065 aluminum. Unlike traditional setups, this plate features threaded mounting holes and custom shouldered hardware to eliminate the risk of backing plate bolts loosening and getting sucked into the engine—a common issue that can cause catastrophic damage. Ramjet solves this with mechanical simplicity and clever design.

What truly sets this air cleaner apart is the boltless bridge system, which allows the air cleaner cover to spin on securely without a front-facing bolt, offering an ultra-clean and refined look. A discrete button-head fastener on the underside of the cover locks the index point in place, ensuring reliable orientation every time.

The Ramjet Hi-Flow Air Cleaner utilizes a high-flow K&N filter element—sized to S&S Super E specs—ensuring easy replacement and excellent filtration. With fitment available for OEM Harley 55mm, Screamin’ Eagle 64mm, and HPI 58mm & 62mm throttle bodies, this system supports a wide range of engine setups. Whether you’re building a sleeper or a full-on performance bagger, this air cleaner is up to the task.

Available in your choice of gloss black Cerakote or show-quality chrome, the finish is both fade-resistant and durable, giving your Harley a timeless, aggressive look.

Key Features:

• CNC-Machined 6065 Billet Aluminum Backing Plate

• Boltless Bridge Cover Design for Clean Aesthetic

• High-Quality K&N Filter (S&S Super E Size)

• Threaded Backing Plate with Custom Shouldered Hardware

• Stainless Steel Machine Breather Bolts

• Gloss Black Cerakote or Chrome Finish

• Made in the USA – Phoenix, AZ

• Complete Hardware Kit Included

• Fits M8 Softail & ’17–’24 M8 Touring Models

Fitment:

Compatible with most M8 Softail and Touring models (excludes 2023–2024 FLHXSE, FLTRXSE, and 2024 FLHX, FLTRX, FLTRXSTSE).

If you’re looking to maximize airflow, boost horsepower, and clean up your Harley’s profile with no exposed hardware, the Ramjet Racing Hi-Flow Air Cleaner is a must-have upgrade. Backed by precision engineering and proudly made in the USA, it’s built for riders who take performance and reliability seriously.