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Muffler & Exhaust · Gallup, NM

The muffler shop in our name — and it earns that name daily.

Custom exhaust, catalytic converter replacement, muffler welds, performance work, and diesel DPF and manifold repair. Pipe-bending on site. Gallup's exhaust specialists since 2012.

Custom exhaust work under a vehicle at American Muffler

What we do

From stock replacements to custom builds.

  • Muffler replacement — direct-fit OEM-equivalent or universal, welded or bolted.
  • Catalytic converter replacement — legal, quality cats, diesel and gas, with heat shields.
  • Custom exhaust — stainless or aluminized, mandrel-bent to fit, on-site pipe bending.
  • Performance exhaust — cat-back and axle-back systems installed, tips and mufflers to taste.
  • Exhaust manifold & header work — cracked manifolds, broken studs, gasket and header jobs.
  • Diesel exhaust — DPF, DEF, and turbo-back diesel exhaust service and repair.
  • Flex pipe & welds — broken hangers, cracked flex pipe, rusted-through sections.
Catalytic converter stolen? We see it too often in Gallup. We install replacements with welded shields and can add anti-theft plates to slow down the next thief. Call us and we'll get you quiet and legal again.

Signs you need exhaust work

If one of these sounds like your truck, bring it in.

Louder than it should be

A sudden volume increase usually means a leak, a cracked weld, or a rusted-through muffler. Simple fix if caught early.

Check-engine light with a P04xx code

Often the catalytic converter or an oxygen sensor. We'll diagnose the exact cause before recommending a cat replacement.

Gas smell in the cabin

Stop driving and call. That's an exhaust leak venting into the cab — dangerous, and needs attention today.

Rattling underneath

Loose heat shield or a broken hanger. Quick fix, easy weld, low cost — it only gets worse if you leave it.

Failed emissions or loud-vehicle ticket

We'll bring you back into legal range with the right cat and a correct install.

Lost power, black smoke (diesel)

Could be DPF, EGR, or turbo-related. We'll diagnose and quote before we touch anything.

Questions

Exhaust FAQ

How much is a new muffler?

For most cars and small trucks, a replacement muffler plus install is typically $180–$450 depending on your vehicle and whether we need custom piping. Heavy-duty diesel work runs higher. Call with your year/make/model for an exact number.

Do you weld on-site?

Yes. MIG welding and mandrel bending in our Gallup shop. We can fabricate a straight-pipe, custom bend, or full exhaust without you waiting for a shipment.

Will a new cat pass emissions?

The cats we install are EPA-compliant and designed to pass. If your vehicle has other emission issues (evap, O2 sensors), we'll flag those too.

Can you make it louder without being obnoxious?

Absolutely. Performance mufflers tuned for tone, not just volume. Come in, listen to our demo setups, and pick what you like.

We answer every call

Need a tow or a repair? Call us right now.

A real person on the line, every time. We'll get you a quote in under a minute — and a truck rolling if you need one.

Call (505) 863-5990
24/7 tow line · tap to call
(505) 863-5990