Dirty Bird Concepts Lower Rear Extension For Harley Freewheeler / Road Glide 3 Dirty Birds Lower Rear Extension enhances Trike style with its hand-laid fiberglass construction. This sleek, streamlined piece, adaptable for either bolt-on or mold-on installations, perfectly accommodates exhaust systems up to 4 1/2 in size. It's an ideal blend of form and functionality for a distinguished look. Features: Enhances lower body styling Fits up to a 4.5 diameter muffler (certain mufflers do need to be extended) Can be bolted or bonded on Easy installation for a hassle-free upgrade! Made in the USA Dirty Bird Concepts has been at the forefront of the custom motorcycle industry for decades, pushing the boundaries of design and performance. Founded by legendary builder John Shope and carried forward by current owner Wyatt Miceli, Dirty Bird Concepts became a household name in the bagger and custom bike world, setting trends with bold, aggressive styling and cutting-edge parts. At the core of Dirty Bird Concepts is a team of skilled engineers, fabricators, and designers who are passionate about building the best products on the market.