Do I need bolts and a band clamp to install this?

Yes. This is the sleeve coupler only — you'll need to source a stainless steel band clamp kit with bolts to secure it. Bolt size and clamp width depend on your pipe wall thickness and application.

Can I use this as a repair patch on a rusted-out muffler connection?

Absolutely. Clean away any loose rust or corrosion from the pipe ends, then slide the coupler over the joint and clamp it down. Works well for emergency repairs and custom routing adjustments.

Will this handle high-temperature exhaust without failing?

Stainless steel handles exhaust heat well, but the real durability depends on how tightly you secure the band clamp. Loose bolts will let heat and vibration work the joint loose — torque consistently and check periodically on new installations.