Supercrazy 1-1/8" to 3-1/2" 3PCS Car Tail Pipe Expander Tool kit SF0013 This Tail Pipe Expander set is designed to quickly and easily straighten clamp dents in mufflers and tail pipes. Drop forged and heat treated steel construction for strength and durability. Set includes three different expander sizes. A simple wrench turn expands pipe for exhaust system repair and installation. Works with all 1-1/8 to 3-1/2" lD. thin-wall pipes. For use on all types of tail pipes, mufflers, and exhaust systems.