This woven silica tape has been tested to withstand sustained operating temperatures of 1,800 degrees Fahrenheit. It’s designed to seal exhaust joints on the muffler when repacking or where the muffler attaches to the header pipe. This thin tape effectively seals the exhaust system against vapor and engine residue leaks at couplings. There are two pieces of 8-inch tape per package. The MSRP is $15.50.