Big Sucker Stage I Air Filter (manufacturer part number: 50-574) by Arlen Ness: a sleek intake kit designed for roadsters and Sportsters. Its monoblock aluminium support plate and black round design provide a minimalist style while enhancing airflow to the injector or carburettor.
- Concealed breather: O-rings at the cylinder heads and outlet directed towards the injector/carb inlet to ensure engine ventilation without external hoses.
- Optimised intake: radius entry designed for unobstructed airflow, promoting a more direct intake.
- Construction: monoblock aluminium plate, water-resistant black finish.
- Compatibility: designed to fit OEM single-bolt air filter covers and compatible with Arlen Ness Stage 1 covers. Check compatibility with certain models; specific kits available.
- Complete kit: all mounting hardware and instructions are included for a clean installation.
Particularly suitable for recent Harley-Davidson Sportsters (e.g. XL 1200 Forty‑Eight, Forty‑Eight Special, Superlow 2020). Note: while compatible with several years, the breather system is not applicable to certain '88-'90 models. Ideal for those seeking a polished look and rethought intake without modifying breather management.
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