This muzzle brake or air stripper screws onto the front of the fat boy. 

Note: This unit does not come with the individual air strippers. You can change the caliber size by using the inserts that was included with the fat boy.

Features:

• Made of aluminum 6061 T6
• Black anodize
• Weights 2.9 oz

Add the optional 3 inch extender for the fatboy to make it quieter!
Extender