ORIGINAL: dirtybird
Check the specs. No locktite is rated for the temperature expected of muffler bolts.
From the Loctite website:
<h1 style="">Loctite 272 High Temperature, High Strength Red Threadlocker</h1>
<div class="longText">
</p>
Top Pick Loctite® 272™ High Temperature, High Strength Red Threadlocker withstands temperatures to 450°F. Provides a fast cure on most surfaces, including "as received" fasteners. Recommended for bolts up to 1 1/2" (36 mm) in diameter. Heat and hand tools are required for disassembly.</p></div>Dirtybird, just how hot do you run your engines?