Upower 2.5" x 8" w/Ends 12" OAL Exhaust Flex Pipe Heavy Duty Stainless Steel 2.5 Inch Diameter Exhaust Flex Extension Pipe Connector Tube 25008DN Couplings

I have 2.5" exhaust and this slipped right on and I used lap joint clamps to keep it in place. You can also weld it if you have the tools and the skills, but it is not necessary.

Worked well. Good price point.