Symptoms
- Noticeably louder, sometimes deeper-sounding exhaust
- Visible rust hole or flaking metal on the muffler when inspected
- Sound may vary with acceleration
- Possible visible rust streaks or scaling on the muffler body
Likely causes
- CommonAge and corrosion from moisture cyclingMufflers collect condensation inside and rust from the inside out over years of use.
- CommonRoad salt exposureSalt used for winter roads accelerates rust on the underside of the exhaust system.
- PossibleFrequent short trips preventing full dryingShort drives don't get the exhaust hot enough for long enough to evaporate internal condensation.
- Less commonPhysical impact damage (curb, road debris)A dent or scrape can weaken metal that later rusts through faster at that spot.
What to do
- Look underneath for a hole, rust-through, or a section that looks thin, flaky, or scaled.
- Note how loud and where the noise is coming from to help a shop find it quickly.
- Get a repair quote comparing a patch/clamp repair versus a full muffler replacement.
- A temporary exhaust repair tape or clamp kit can quiet a small hole short-term but isn't a permanent fix.
- Have the muffler replaced or professionally welded once you can get it to a shop.
- Consider a stainless steel replacement if you live somewhere with heavy road salt, since it resists rust much longer.
Tools and parts
- Flashlight
Muffler repair clamp/patch kitSearch: “muffler repair clamp kit”
Replacement mufflerSearch: “muffler for [year make model]”
When to call a pro
A muffler shop can weld in a proper repair or replacement quickly and confirm there isn't a second weak spot nearby.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.