Ride a high-horsepower Harley? A bike tuned for high compression, large displacement, high-lift, or extended duration cams? If so, these Vance & Hines Hi Output Slip-On mufflers are made for your motorcycle. By improving the volumetric efficiency of heavily modified or custom-built engines, these 4-1/2" pipes deliver maximum horsepower. Made to work on Harley-Davidson Touring bikes with 96, 103, 107, 110 and 117 cubic inch engines, these slip-ons feature CNC-machined end caps and also fit nicely with saddlebags and extended skirts.; ; Designed specifically to address the needs of tuned motors built for high horsepower applications (high compression, large displacement, big cams) Every aspect is singularly focused to yield maximum horsepower by improving the volumetric efficiency of heavily modified engines as well as stock Compatible with Dresser Duals, Power Duals and CVO drop skirt bags Optional quiet inserts 442-831 sold separately