Arlen Ness Stage 1 "Big Sucker" Air Filter Kit '08-'11 #18-512

• Gain up to 12% more Horsepower by simply installing a Big Sucker™ on your bike!

• These kits are designed to be used with the stock air filter cover (except Sportster™ & 08-11 FXD)

• Sportster™ models require the purchase of a custom outer air cleaner

• These kits can be used as an exposed filter design when using one of our Stage 1 billet covers

NOTE: Image may or may not show backing plate with correct finish

NOTE: When tested on (08 FLHX) the Big-Sucker Stage 1 made a 19% horsepower increase