Big Sucker Stage 1: 48, 72, Iron; chrome

Arlen Ness claims this is the best and simplest performance air cleaner kits for your Harley-period!
The Ness "Sucker" backing plate features a built-in carburetor support and built-in breather tunnels at each head to decrease crankcase pressure. Each tunnel exits at the mount of the carburetor to create a virtually closed-loop system. Breather features o-ring banjo bolt seals and a radiused intake manifold. No oil hoses, no oil fittings, no leaking and no mess! All kits include a "Big Sucker" aluminum backing plate, Team Ness High-Flow air filter, simple instructions and all necessary hardware. These kits are a "Stealth" design as they are used with the stock outer air filter cover.

Applications:
Sportster all XL models 1988 to present (except 2016 to present Seventy Two, Forty Eight and Iron): Use kit E
Sportster Seventy Two, Forty Eight and Iron 2016 to present: Use kit B

Dyna 2008-2017 (except FXDB Street Bob and 2016-2017 FXDLS Low rider S): Use kit C
Dyna FXDLS Low Rider S 2016-2017: Use kit A

Softail 2016-2017: Use kit A

Touring 2014-2016: Use kit A
Touring 2017 to present: Use kit D

Trike 2014-2016: Use kit A
Trike 2017 to present: Use kit D