Walker 18431 Exhaust Muffler - Right
OE Quality 60-Day Returns
Walker
 SoundFX Direct Fit

Walker 18431 Exhaust Muffler - Right

Brand Walker 18431
Position Right
Universal Or Specific Fit Specific
Shape Oval
Grade Type Regular
Inlet Inside Diameter 2
Body Width 9.75
Inlet Quantity 1
Outlet Inside Diameter 1.875
Outlet Quantity 1
Reversible No
Tunable No
Overall Length 17
Body Height 4.25
Body Length 14
Body Material Steel
Finish Aluminized
Inlet 1 Inside Diameter 2
Inlet 1 Type Pipe connection
Inlet Configuration Offset
Inlet Offset 2.875
Inlet Type Pipe connection
Muffler Type Combination
Outlet 1 Inside Diameter 1.875
Outlet 1 Type Pipe connection
Outlet Configuration Center
Outlet Type Pipe connection
Product line SoundFX Direct Fit
Fits Oldsmobile and Pontiac · 20 vehicles

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

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

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

Cross-references AP Exhaust 700215, TYC 700192 and 700444 for the same application. See all 3.

$58.47Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.

Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $58.47
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Exhaust Muffler options

Walker SoundFX Direct Fit Muffler for GM V6 Applications

Walker SoundFX Direct Fit muffler Part Number 18431 is a specific-fit exhaust muffler built for select Pontiac Grand Prix and Oldsmobile Cutlass Supreme applications with dual exhaust. 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 sound.

Key Features

  • Specific-fit exhaust muffler for confirmed vehicle applications
  • Oval body shape with aluminized steel construction
  • 2-inch inlet with offset configuration
  • 1.875-inch center outlet with pipe connection
  • Mechanical interior joints and spun-locked heads for added durability
  • Combination muffler design for direct-fit replacement use
  • Walker SoundFX Direct Fit line focuses on OE-style fit and acoustics

Product Details

Walker SoundFX Direct Fit Part Number 18431 is engineered for select 1990-1996 Pontiac Grand Prix and 1991-1993 Oldsmobile Cutlass Supreme models with dual exhaust. Fitment includes Pontiac Grand Prix applications in N/A and right-side positions, plus Oldsmobile Cutlass Supreme applications in N/A and right-side positions, depending on the vehicle configuration. The muffler measures 17 inches overall, with a 14-inch body length, 9.75-inch body width, and 4.25-inch body height. Its aluminized steel finish helps resist corrosion, while the offset inlet and center outlet layout support direct replacement on the listed vehicles.

This part cross-references AP Exhaust 700215 for the same application.

What This Muffler Helps Address

  • Exhaust noise from a worn or rusted muffler
  • Corrosion-related muffler failure on older GM vehicles
  • Fitment issues when replacing a factory-style muffler
  • Exhaust tone changes caused by internal muffler damage
  • Replacement needs on Pontiac Grand Prix and Oldsmobile Cutlass Supreme dual-exhaust systems

Installation Notes and Tips

  • Fits 1990 Pontiac Grand Prix, N/A and right; 2nd design; with dual exhaust.
  • Fits 1991-1996 Pontiac Grand Prix, N/A and right; with dual exhaust.
  • Fits 1991-1993 Oldsmobile Cutlass Supreme, N/A and right; with dual exhaust.
  • If the exhaust uses a welded assembly, replace all required parts or verify whether additional modifications are needed.
  • Confirm inlet and outlet orientation before installation: 2-inch offset inlet and 1.875-inch center outlet.

Quality Assurance

Walker SoundFX Direct Fit mufflers are built with aluminized steel, mechanical interior joints, and spun-locked heads to support durability and consistent fit on the listed applications. Part Number 18431 is made for direct-fit replacement use on confirmed Pontiac Grand Prix and Oldsmobile Cutlass Supreme exhaust systems.

Related reading

This part fits 20 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
1996PontiacGrand Prix3.1LV6N/Awith Dual Exhaust; If welded assembly, replace all required parts; SoundFX Direct Fit
1996PontiacGrand Prix3.1LV6Rightwith Dual Exhaust; If welded assembly, modifications and/or additional parts may be required.; SoundFX Direct Fit
1995PontiacGrand Prix3.1LV6N/Awith Dual Exhaust; If welded assembly, replace all required parts; SoundFX Direct Fit
1995PontiacGrand Prix3.1LV6Rightwith Dual Exhaust; If welded assembly, modifications and/or additional parts may be required.; SoundFX Direct Fit
1994PontiacGrand Prix3.1LV6N/Awith Dual Exhaust; If welded assembly, replace all required parts; SoundFX Direct Fit
1994PontiacGrand Prix3.1LV6Rightwith Dual Exhaust; If welded assembly, modifications and/or additional parts may be required.; SoundFX Direct Fit
1993OldsmobileCutlass Supreme3.1LV6N/Awith Dual Exhaust; If welded assembly, replace all required parts; SoundFX Direct Fit
1993OldsmobileCutlass Supreme3.1LV6Rightwith Dual Exhaust; If welded assembly, replace all required parts; SoundFX Direct Fit
1993PontiacGrand Prix3.1LV6N/Awith Dual Exhaust; If welded assembly, replace all required parts; SoundFX Direct Fit
1993PontiacGrand Prix3.1LV6Rightwith Dual Exhaust; If welded assembly, modifications and/or additional parts may be required.; SoundFX Direct Fit
1992OldsmobileCutlass Supreme3.1LV6N/Awith Dual Exhaust; If welded assembly, replace all required parts; SoundFX Direct Fit
1992OldsmobileCutlass Supreme3.1LV6Rightwith Dual Exhaust; If welded assembly, replace all required parts; SoundFX Direct Fit
1992PontiacGrand Prix3.1LV6N/Awith Dual Exhaust; If welded assembly, replace all required parts; SoundFX Direct Fit
1992PontiacGrand Prix3.1LV6Rightwith Dual Exhaust; If welded assembly, modifications and/or additional parts may be required.; SoundFX Direct Fit
1991OldsmobileCutlass Supreme3.1LV6N/Awith Dual Exhaust; If welded assembly, replace all required parts; SoundFX Direct Fit
1991OldsmobileCutlass Supreme3.1LV6Rightwith Dual Exhaust; If welded assembly, replace all required parts; SoundFX Direct Fit
1991PontiacGrand Prix3.1LV6N/Awith Dual Exhaust; If welded assembly, replace all required parts; SoundFX Direct Fit
1991PontiacGrand Prix3.1LV6Rightwith Dual Exhaust; If welded assembly, modifications and/or additional parts may be required.; SoundFX Direct Fit
1990PontiacGrand Prix3.1LV6Right2nd Design; with Dual Exhaust; If welded assembly, modifications and/or additional parts may be required.; SoundFX Direct Fit
1990PontiacGrand Prix3.1LV6N/A2nd Design; with Dual Exhaust; If welded assembly, replace all required parts; SoundFX Direct Fit
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
AP Exhaust — 700215TYC — 700192700444