This pair of Outlaw Breather Bolts will really clean up your ride! No more hoses or filter. The filter is built into the bolt. The EPA has required Harley to route dirty, oily crankcase air back into the air cleaner compromising the performance of your engine. This vents it without compromising the performance or longevity of your motor. Caution: Motorcycles modified with this DK Custom Products High-Performance part may not be legal for public highway use in some areas. The user shall determine suitability of this product for his or her use. With the Outlaw Racing Breather Bolts you will experience a slight performance increase. This is because engines like Cold Dry air! Also available in Brass & Polished Aluminum. These are a must-have when doing your Stage 1 upgrade. E-Z Install Fits All Twin Cam & Milwaukee-Eight Motors (1999-Up) Fitment Notes: These will work with The Outlaw type Air Cleaners from DK Custom and any other air cleaner that uses a 1/8" thick support bracket. These Breathers come in 1 size- 3/4" thread length These Military Grade Stage 3 Black Anodized Breather Bolts have a rating of 80 Rockwell hardness to the black anodization. They have a high resistance to chipping or discoloring. They also come with THREE different color screens. Brass, Copper and Steel. Also included are 2 extra filters.