Arlen Ness - Big Sucker Stage 1 Air Cleaner Kit
Brand New in Box
Fits Cleanly Under Original Air Cleaner Cover

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The Arlen Ness 18-510 Big Sucker Stage 1 Air Cleaner Kit is A high-performance intake system designed explicitly for Harley Davidson, twin cam models, equipped with throttle by wire (TBW/FBW). This kit replaces the restrictive factory air cleaner to optimize airflow, noticeably boosting horsepower and torque.
Target Fitment
The 18-510 part number features a "Natural" (raw aluminum) finish backing plate and is specifically designed to fit:
  • 2008–2016 Harley-Davidson Touring / Bagger Models (FLHT, FLHR, FLHX, FLTR, and H-D Trike)
  • 2016–2017 Softail Models
  • 2016–2017 Dyna Low Rider S (FXDLS)
  • Note: This kit is built strictly for Electronic Throttle-by-Wire engines and will not fit older cable-driven throttle systems.
Key Product Features
  • Patented Hidden Breather Technology: The one-piece aluminum backing plate features internal breathing passages. Each breather is O-ringed at the heads and exits directly at the mouth of the throttle body. This design creates a virtually closed-loop system, eliminating unsightly external hoses and brackets.
  • Radius Air Inlet: Engineered with a smooth, unobstructed radius entry point to maximize the velocity and volume of air flowing into the engine.
  • Premium Washable Filter: Equipped with a pre-oiled, 4-layer surgical grade red cotton gauze element that is completely reusable. You simply wash, dry, and re-oil it rather than replacing it.
  • Cover Compatibility: The stage 1 architecture is engineered to accept your factory single-bolt outer air cleaner cover or any Arlen Ness Stage 1 custom decorative cover, allowing you to maintain an OEM look if desired.
Performance & Regulatory Compliance
  • Stage 1 Tuning: Because it introduces a significantly higher volume of air, it is highly recommended to pair this kit with an upgraded exhaust system and a fuel controller/tuner to keep your engine's air/fuel ratio safe and optimized.
  • CARB Status: It is exempt per California Air Resources Board (CARB) Executive Order E.O. #D-639-12_R-01 (or #D-639-7 depending on the exact year profile), making it legal for use in all 50 states on specified fuel-injected models.
Standard Kit Contents
Every kit comes complete with:
  1. One-piece aluminum backing plate (Natural finish)
  2. Pre-oiled high-flow performance air filter element
  3. Support brackets and specialized O-ringed banjo bolts
  4. Necessary gaskets, hardware, and installation instructions