Walker 18820 Exhaust Muffler
OE Quality 60-Day Returns
Walker
 SoundFX Direct Fit

Walker 18820 Exhaust Muffler

Brand Walker 18820
Universal Or Specific Fit Specific
Shape Oval
Grade Type Regular
Inlet Inside Diameter 2
Body Width 11
Inlet Quantity 1
Reversible No
Tunable No
Overall Length 28
Body Height 5.5
Body Length 15
Body Material Steel
Finish Aluminized
Inlet 1 Inside Diameter 2
Inlet 1 Type Pipe connection
Inlet Configuration Offset
Inlet Offset 3.5
Inlet Type Pipe connection
Muffler Type Combination
Outlet 1 Outside Diameter 2.25
Outlet 1 Type Tip
Outlet 2 Outside Diameter 2.25
Outlet Configuration Center
Outlet Outside Diameter 2.25
Outlet Quantity 2
Outlet Type Tip
Product line SoundFX Direct Fit
Fits Buick · 10 vehicles

Direct-fit design. Specific fit for easier installation and a cleaner replacement.

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

SoundFX tuning. Delivers quality appearance with favorable acoustics.

Cross-references AP Exhaust 700338 for the same application. See all 1.

$94.49Free shipping
In stock · usually ships same day before 1pm CST
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Step 2 — Quantity
Order total $94.49
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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 for Regal

Walker SoundFX Direct Fit muffler Part Number 18820 is built for specific vehicle applications and is engineered for a clean OE-style replacement. It uses 100% aluminized steel for improved service life versus low-carbon steel, along with a quality appearance and controlled exhaust acoustics.

Compatible with 1997-2004 Buick Regal, this Walker muffler is a direct-fit exhaust solution for drivers replacing a worn or noisy factory unit. The oval body, offset 2-inch inlet, and dual 2.25-inch center outlets support a factory-style layout on the Buick Regal exhaust system.

Key Features

  • Specific-fit exhaust muffler for confirmed Buick Regal applications
  • Walker SoundFX Direct Fit product line for OE-style replacement fitment
  • 100% aluminized steel body for longer service life than low-carbon steel
  • Oval muffler design with aluminized finish
  • Offset 2-inch inlet with pipe connection
  • Dual 2.25-inch center outlets with tip-style outlet configuration
  • Mechanical interior joints and spun-locked heads for added durability

Product Details

Walker Part Number 18820 is a combination-type exhaust muffler with a steel body, 11-inch body width, 5.5-inch body height, and 15-inch body length. The overall length is 28 inches, and the inlet uses a 2-inch inside diameter with a 3.5-inch offset. This design supports a direct-fit replacement on 1997-2004 Buick Regal models while maintaining a factory-oriented exhaust layout. This part cross-references AP Exhaust 700338 for the same application.

What It Helps Address

  • Exhaust noise from a damaged or rusted muffler
  • Corrosion-related failure in the original muffler housing
  • Fitment issues caused by an incorrect replacement muffler
  • Loss of factory-style exhaust routing on Buick Regal models
  • Need for a direct-fit muffler replacement on 1997-2004 Buick Regal

Installation Notes

Fits 1997-2004 Buick Regal, N/A. If the exhaust uses a welded assembly, replace all required parts during service to restore proper fit and function. Verify inlet and outlet dimensions, offset, and overall length against the existing exhaust before installation. Walker SoundFX Direct Fit Part Number 18820 is intended for specific applications, so matching the vehicle configuration is important for a correct installation.

Quality Assurance

Walker SoundFX Direct Fit mufflers are built with aluminized steel construction, mechanical interior joints, and spun-locked heads to support durability in everyday exhaust service. The product line is positioned as a direct-fit replacement option for drivers seeking OE-style appearance and acoustics on Buick Regal applications.

Related reading

This part fits 10 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelLitersCylindersPositionNotes
2004BuickRegalLS3.8LV6N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
2004BuickRegalGS3.8LV6N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
2003BuickRegalLS3.8LV6N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
2003BuickRegalGS3.8LV6N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
2002BuickRegal—3.8LV6N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
2001BuickRegal—3.8LV6N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
2000BuickRegal—3.8LV6N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
1999BuickRegal—3.8LV6N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
1998BuickRegal—3.8LV6N/AIf welded assembly, replace all required parts; SoundFX Direct Fit
1997BuickRegal—3.8LV6N/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 — 700338