How do I stop exhaust system rattle on Honda CR-V?

SOURCE: Loud rattling noise

the heat shield on the exhaust manifold

SOURCE: Sporadic squealing/rattling from the rear

BRAKES ARE RATTLING IN DISC BRAKE CALIPER, TRY NEW SET OF PADS WITH FIXING KIT/TENSION SPRINGS..

SOURCE: rattle in under dash

IT COULD BE A EXHAUST HEAT SHIELD ALOT OF TIMES IF THAT IS WHAT IT IS I JUST REMOVE THEM IT WONT HURT ANYTHING CHECK ON TOP AND BOTTOM OF YOUR CATALYTIC CONVERTER

SOURCE: 1999 Honda CR-V rattles during acceleration

Usually it is a loose rusted exhaust heat shield or shields.
Slide under and tap the exhaust system and shields from front (on the engine )to back.......there will be at least one rattle heard.

SOURCE: loose heat shield

Most likely it's a heat sheild on the converter, maybe the muffler. 1 on top and 1 on the bottom. The heat sheild is welded to the converter, over time they rust away, around the welds. You can use a large diameter worm gear clamp to keep the heat sheild from rattling. The sheilds are in place so if you drive over grass, the heat from the converter won't ignite the grass.