Walker 18342 Exhaust Muffler
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Walker
 SoundFX Direct Fit

Walker 18342 Exhaust Muffler

Brand Walker 18342
Universal Or Specific Fit Specific
Shape Oval
Grade Type Regular
Inlet Inside Diameter 2.5
Body Width 9.75
Inlet Quantity 1
Outlet Inside Diameter 2.5
Outlet Quantity 1
Reversible No
Tunable No
Overall Length 29
Body Height 4.25
Body Length 24
Body Material Steel
Finish Aluminized
Inlet 1 Inside Diameter 2.5
Inlet 1 Type Pipe connection
Inlet Configuration Offset
Inlet Offset 2.875
Inlet Type Pipe connection
Muffler Type Combination
Outlet 1 Inside Diameter 2.5
Outlet 1 Type Pipe connection
Outlet Configuration Center
Outlet Type Pipe connection
Product line SoundFX Direct Fit
Fits Chevrolet and GMC · 10 vehicles

Direct-fit replacement. Specific-fit muffler installs cleanly with pipe connections.

Aluminized steel. Helps resist corrosion for longer service life.

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

$62.75Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Step 2 — Quantity
Order total $62.75
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Free returns within 60 days if it doesn't fit when fitment is verified.
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Walker SoundFX Direct Fit Muffler

Walker SoundFX Direct Fit muffler Part Number 18342 is a specific-fit exhaust muffler built for select Chevrolet and GMC P20, P2500, P30, and P3500 applications. It uses 100% aluminized steel for improved service life versus low-carbon steel and is shaped for a direct replacement with favorable acoustics and a quality appearance.

Key Features

  • Specific-fit exhaust muffler for select vehicle applications
  • Oval combination muffler design
  • 2.5-inch inlet and 2.5-inch outlet
  • Offset inlet configuration with center outlet configuration
  • 100% aluminized steel body with aluminized finish
  • Mechanical interior joints and spun-locked heads for added durability
  • Walker SoundFX Direct Fit line for OE-style replacement needs

Product Details

Walker SoundFX Direct Fit Part Number 18342 is built as a direct replacement muffler for exhaust systems that require a 2.5-inch pipe connection. The oval steel body measures 24 inches long, 9.75 inches wide, and 4.25 inches high, with an overall length of 29 inches. Its offset inlet and center outlet layout supports the factory-style routing used on select Chevrolet P20 and P30, as well as GMC P2500 and P3500 chassis applications. This part cross-references Monroe Shocks & Struts (e.g., 172286) for the same application.

The SoundFX Direct Fit product line focuses on replacement mufflers that match vehicle-specific exhaust layouts while maintaining a clean appearance and controlled exhaust tone. For buyers searching for a 1996 Chevrolet P30 muffler, 1996 GMC P3500 exhaust muffler, or a 1989 Chevrolet P20 / GMC P2500 direct-fit replacement, Part Number 18342 provides the listed configuration and dimensions needed for a proper match.

Common Exhaust Issues It Can Address

  • Rust-through or corrosion in the original muffler body
  • Exhaust noise caused by a damaged internal muffler structure
  • Poor fitment from a universal replacement muffler
  • Factory exhaust routing that requires an offset inlet and center outlet layout
  • Replacement needs on select Chevrolet and GMC chassis applications

Installation Notes and Tips

Verify inlet and outlet diameter, body dimensions, and offset/center configuration before installation. This muffler is not reversible and is not tunable. For 1996 Chevrolet P30 and 1996 GMC P3500 applications, the listing notes that it requires 47653; if the exhaust is a welded assembly, replace all required parts. For 1989 Chevrolet P20 and 1989 GMC P2500 applications, the listing specifies use with a single catalytic converter. Confirm the existing exhaust layout against the vehicle before ordering.

Quality Assurance

Walker builds this SoundFX Direct Fit muffler with aluminized steel construction, mechanical interior joints, and spun-locked heads to support durability in exhaust service. The design is intended to provide a direct-fit replacement with the specified dimensions and configuration for the listed Chevrolet and GMC applications.

Related reading

This part fits 10 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersWheel BasePositionNotes
1996ChevroletP305.7LV8133.0"N/ARequires 47653; If welded assembly, replace all required parts; SoundFX Direct Fit
1996ChevroletP305.7LV8157.0"N/ARequires 47653; If welded assembly, replace all required parts; SoundFX Direct Fit
1996ChevroletP305.7LV8125.0"N/ARequires 47653; If welded assembly, replace all required parts; SoundFX Direct Fit
1996ChevroletP305.7LV8178.0"N/ARequires 47653; If welded assembly, replace all required parts; SoundFX Direct Fit
1996GMCP35005.7LV8133.0"N/ARequires 47653; If welded assembly, replace all required parts; SoundFX Direct Fit
1996GMCP35005.7LV8157.0"N/ARequires 47653; If welded assembly, replace all required parts; SoundFX Direct Fit
1996GMCP35005.7LV8178.0"N/ARequires 47653; If welded assembly, replace all required parts; SoundFX Direct Fit
1996GMCP35005.7LV8125.0"N/ARequires 47653; If welded assembly, replace all required parts; SoundFX Direct Fit
1989ChevroletP205.7LV8125.0"N/Awith Single Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit
1989GMCP25005.7LV8133.0"N/Awith Single Catalytic Converter; If welded assembly, replace all required parts; SoundFX Direct Fit