Walker 18948 Exhaust Muffler
OE Quality 60-Day Returns
Walker
 SoundFX Direct Fit

Walker 18948 Exhaust Muffler

Brand Walker 18948
Universal Or Specific Fit Specific
Shape Oval
Grade Type Regular
Inlet Inside Diameter 2.25
Body Width 11
Inlet Quantity 1
Outlet Quantity 1
Reversible No
Tunable No
Overall Length 27.25
Body Height 5.5
Body Length 15
Body Material Steel
Finish Aluminized
Inlet 1 Inside Diameter 2.25
Inlet 1 Type Pipe connection
Inlet Configuration Offset
Inlet Offset 3.75
Inlet Type Pipe connection
Muffler Type Combination
Outlet 1 Outside Diameter 2.25
Outlet 1 Type Tip
Outlet Configuration Center
Outlet Outside Diameter 2.25
Outlet Type Tip
Product line SoundFX Direct Fit
Fits Chevrolet · 8 vehicles

Direct-fit design. Installs as a specific replacement with no guesswork.

Aluminized steel. Helps resist corrosion for longer service life than low-carbon steel.

Mechanical interior joints. Spun-locked heads add durability inside the muffler.

Cross-references AP Exhaust 700450 for the same application. See all 1.

$66.40Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Step 2 — Quantity
Order total $66.40
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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Walker SoundFX Direct Fit Muffler for GM Sedans

Walker SoundFX Direct Fit muffler Part Number 18948 is a specific-fit exhaust muffler built for select Chevrolet Impala and Chevrolet Monte Carlo applications. It uses 100% aluminized steel for improved service life versus low-carbon steel and is shaped for a clean, OE-style appearance with controlled exhaust acoustics.

Key Features

  • Specific-fit exhaust muffler for confirmed vehicle applications
  • Oval combination muffler design with 2.25 in. inlet and 2.25 in. outlet
  • Offset inlet and center outlet configuration for application-specific routing
  • 100% aluminized steel body for corrosion resistance and longer service life
  • Mechanical interior joints and spun-locked heads for added durability
  • Walker SoundFX Direct Fit line focuses on OE-style fit and balanced sound control

Detailed Description

Walker 18948 is a direct-fit muffler engineered for 2006-2011 Chevrolet Impala models with 1 catalytic converter and for 2006-2007 Chevrolet Monte Carlo models. The oval steel body measures 27.25 inches overall, with a 15-inch body length, 11-inch body width, and 5.5-inch body height. Its aluminized finish helps resist rust, while the offset inlet and center outlet layout supports the original exhaust path on the listed vehicles. This part cross-references AP Exhaust 700450 for the same application.

The SoundFX Direct Fit product line is positioned for drivers who want a replacement muffler that matches the vehicle’s exhaust layout and maintains a controlled sound profile without changing the system’s basic configuration. Walker 18948 is a practical choice for Chevrolet Impala and Chevrolet Monte Carlo exhaust repair when the original muffler is worn, noisy, or corroded.

What It Helps Fix

  • Exhaust noise caused by a damaged or rusted muffler
  • Rattling or resonance from a deteriorated internal muffler structure
  • Corrosion-related exhaust leaks at the muffler body
  • Restricted exhaust flow from a failing replacement muffler
  • Fitment issues when replacing a direct-fit muffler on the listed Chevrolet Impala and Chevrolet Monte Carlo applications

Installation Notes and Tips

Compatible with 2006-2011 Chevrolet Impala, N/A, with 1 catalytic converter; if welded assembly, replace all required parts; SoundFX Direct Fit. Compatible with 2006-2007 Chevrolet Monte Carlo, N/A; if welded assembly, replace all required parts; SoundFX Direct Fit. Verify inlet and outlet orientation before installation, since this muffler uses an offset inlet and center outlet configuration. Confirm the exhaust system condition on welded assemblies so the replacement matches the required repair scope.

Quality Assurance

Walker builds this muffler with aluminized steel, mechanical interior joints, and spun-locked heads to support durability in everyday exhaust service. Part Number 18948 is designed as a direct-fit replacement for the listed Chevrolet applications and follows the SoundFX Direct Fit product line’s OE-style approach to fit and acoustics.

Related reading

This part fits 8 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2011ChevroletImpala3.5LV6N/Awith 1 Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
2010ChevroletImpala3.5LV6N/Awith 1 Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
2009ChevroletImpala3.5LV6N/Awith 1 Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
2008ChevroletImpala3.5LV6N/Awith 1 Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
2007ChevroletImpala3.5LV6N/Awith 1 Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
2007ChevroletMonte Carlo3.5LV6N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
2006ChevroletImpala3.5LV6N/Awith 1 Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
2006ChevroletMonte Carlo3.5LV6N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
AP Exhaust — 700450