Neighbor Hater Mufflers - For riders who think that too loud is just about right. Four-inch bodies bell out to 4-1/2in. at the rear, which features a smooth, rolled end. Smooth, rolled end shape adds a megaphone enhancement to the sound. Spiraled louvered core exits in a trumpet-bell shape that allows the V-Twin sound track to flow at full song. Sold in pairs. Made in the u. s. a.