GearWrench 2071D Exhaust and Tailpipe Expander (1-13/16” to 2-1/2”) GearWrench 2071D Exhaust and Tailpipe Expander (1-13/16” to 2-1/2”) can flare, shape and expand tailpipes to ensure a tight fit and prevent exhaust leaks, any pipe size 1-1/2” to 2-1/2” and 38mm to 63.5mm, turn handle to adjust the expander to the diameter of the pipe.