# Muffler Repair and Replacement in Upland > Muffler rattling, rusted or blowing out? Route 66 Auto Repair in Upland checks whether it can be repaired or must be replaced, with photos and a written estimate. Source: https://route66autorepairshop.com/exhaust-services/muffler-repair Updated: 2026-09-17 Business: Route 66 Auto Repair, 1775 W Foothill Blvd, Upland, CA 91786, (909) 608-7699 Hours: Monday to Friday 8 AM–5 PM, Saturday 8 AM–2 PM, Sunday closed **TLDR:** The **metal condition** decides repair or replace. We show you **photos of the muffler** and quote the lasting fix, not the quickest one. A muffler that rattles, rusts through or suddenly gets loud is one of the most common reasons drivers visit Route 66 Auto Repair in Upland. Our technicians check the muffler case, seams, inlet and outlet joints, and the hangers holding it, then tell you honestly whether a repair will last or replacement is the better spend. You see photos and a written estimate before anything is cut or unbolted. ## What are the signs your muffler is failing? - A louder exhaust note that keeps getting worse - Rattling from the rear of the car, loudest at idle - Rust holes or a wet, crusty bottom seam - Water dripping from a seam, not just the tailpipe - The muffler sitting lower than it used to ## When is a muffler worth repairing? A muffler is worth repairing when the case itself is sound and the problem sits around it. A leaking inlet joint, a failed clamp, a broken hanger or a torn isolator can all be fixed while the muffler stays in place. We tap the case: a clear ring means solid metal, a dull thud or flaking means rot. Replacement is the better call when the case has rusted through, the seams are soft, or the inside has come apart. Short trips leave water inside mufflers, so they often rot from the inside, and a hole you can see usually has thin metal around it. Patching that just moves the leak. When we replace, we check the pipe ahead of it, because a new muffler on a rotten pipe is a short-lived fix. For noise that comes from the muffler's internals, our [muffler silencer repair](https://route66autorepairshop.com/exhaust-services/muffler-silencer-repair) page explains that side. ## Our muffler repair process 1. **Inspect the case and joints:** On the lift we tap the case, check seams and inspect the inlet, outlet and hangers. 2. **Show you and quote:** You get photos and a written estimate for repair or replacement, with the reasoning. 3. **Repair or fit the new muffler:** We fix or replace what you approved, using new clamps, gaskets and isolators as needed. 4. **Leak and rattle check:** We run the engine, check the joints and road-test over bumps. ## What's included in a muffler repair - Muffler case and seam inspection - Inlet and outlet joint leak check - Hanger and isolator check - Photos of the muffler condition - New clamps or gaskets at opened joints - Road test for noise and rattles ## Is a muffler repair need-now or need-later? **Need now:** - The muffler is hanging or dragging - A leak ahead of it lets fumes reach the cabin **Need later:** - A slightly louder note with sound mounts - Surface rust on a case that still rings solid ## How pricing and timing work Price depends on your vehicle, whether a direct-fit muffler is available, and how the pipe and hangers look. We never quote a phone price as final. AAA members get 10% off parts and labor, up to $75. Most muffler jobs are same-day when the board allows. See the [exhaust repair hub](https://route66autorepairshop.com/exhaust-services) for other exhaust symptoms. ## Frequently asked questions ### Can a muffler be repaired or must it be replaced? If the case is solid and the leak is at a joint, clamp or hanger, a repair usually lasts. If the case is rusted through or the seams are soft, replacement is the lasting fix. We show you photos so you can see the difference. ### Will a new muffler make my car quieter than before? It should bring the sound back to about where it was when the old one was healthy. If there is also a leak upstream, fixing only the muffler will not quiet the car, so we check the whole run, including the [exhaust hangers](https://route66autorepairshop.com/exhaust-services/exhaust-hanger-replacement). ### Why did my muffler rust out when the rest looks fine? Mufflers collect water. Short trips never get the system hot enough to boil it off, so the muffler rusts from the inside first. Longer drives now and then help the next one last. --- Call (909) 608-7699 or visit https://route66autorepairshop.com/contact for a written estimate.