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Walker 18578 Exhaust MufflerOE Quality 60-Day Returns
Part #: 18578

Walker 18578 Exhaust Muffler

SoundFX Direct Fit
10 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$65.29Free Shipping
Free ShippingNo Cost to Continental U.S.
Free Returns*Wrong fit? No cost
60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
SoundFX Direct Fit
Fitment: Buick, Chevrolet, and Oldsmobile, Achieva, Corsica, and Skylark
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST
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Overview of Walker SoundFX Direct Fit Exhaust Muffler 18578

The Walker SoundFX Direct Fit Exhaust Muffler 18578 is designed specifically for select Buick, Chevrolet, and Oldsmobile models, including the Achieva, Corsica, and Skylark. This oval-shaped muffler offers a precise fit and reliable performance for your vehicle's exhaust system.

  • Specific fit for Buick Achieva, Chevrolet Corsica, and Oldsmobile Skylark
  • Oval body shape with aluminized steel construction
  • 2-inch inlet and outlet pipe connections with offset inlet configuration
  • Overall length of 36.5 inches and body length of 20 inches
  • Single inlet and outlet with center outlet configuration

Walker SoundFX Direct Fit Product Line Details

The SoundFX Direct Fit line by Walker focuses on providing exhaust mufflers that match the original equipment specifications for direct replacement. This ensures compatibility and ease of installation without the need for modifications. The 18578 muffler maintains the balance of sound reduction and exhaust flow, designed to meet the requirements of the specified vehicle models.

Product Specifications and Features

This Walker exhaust muffler features a durable aluminized steel body with an oval shape measuring 11 inches in width, 5.5 inches in height, and 20 inches in body length. The inlet and outlet pipes both have a 2-inch diameter, with the inlet offset by 3.5 inches to align with the vehicle’s exhaust system. The muffler type is a combination style, providing effective noise reduction while maintaining exhaust efficiency. It is not reversible or tunable, designed for a specific fit and function.

Applications and Problem Solving

  • Replacement for worn or damaged mufflers on Buick Achieva, Chevrolet Corsica, and Oldsmobile Skylark
  • Reduces exhaust noise and vibration for a quieter ride
  • Restores proper exhaust flow to maintain engine performance
  • Prevents exhaust leaks that can cause emissions issues
  • Helps maintain vehicle compliance with noise regulations

Installation Notes and Tips

The Walker SoundFX Direct Fit muffler 18578 is designed for direct replacement on compatible vehicles, requiring no modifications to the exhaust system. Ensure the inlet and outlet pipe diameters match the existing exhaust pipes (2 inches). The offset inlet configuration should be aligned carefully during installation to maintain proper fit and function. Professional installation is recommended to ensure secure connections and optimal performance.

Quality Assurance and Warranty

Constructed from aluminized steel, this muffler offers corrosion resistance suitable for regular driving conditions. Walker provides quality manufacturing standards for the SoundFX Direct Fit line, ensuring durability and reliable performance. Please refer to Walker’s official warranty policy for specific coverage details related to the 18578 part number.

BrandWalker
Part Number18578
PositionSoundFX Direct Fit
Universal Or Specific FitSpecific
ShapeOval
Grade TypeRegular
Inlet Inside Diameter2
Body Width11
Inlet Quantity1
Outlet Quantity1
ReversibleNo
TunableNo
Overall Length36.5
Body Height5.5
Body Length20
Body MaterialSteel
FinishAluminized
Inlet 1 Inside Diameter2
Inlet 1 TypePipe connection
Inlet ConfigurationOffset
Inlet Offset3.5
Inlet TypePipe connection
Muffler TypeCombination
Outlet 1 Outside Diameter2
Outlet 1 TypeTip
Outlet ConfigurationCenter
Outlet Outside Diameter2
Outlet TypeTip

This part fits 10 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
1998BuickSkylark2.4LL4N/ARequires 36153; If welded assembly, replace all required parts; SoundFX Direct Fit
1998OldsmobileAchieva2.4LL4N/ARequires 36153; If welded assembly, replace all required parts; SoundFX Direct Fit
1997BuickSkylark2.4LL4N/ARequires 36153; If welded assembly, replace all required parts; SoundFX Direct Fit
1997OldsmobileAchieva2.4LL4N/ARequires 36153; If welded assembly, replace all required parts; SoundFX Direct Fit
1996BuickSkylark2.4LL4N/ARequires 36153; If welded assembly, replace all required parts; SoundFX Direct Fit
1996ChevroletCorsica2.2LL4N/ARequires 36153; If welded assembly, replace all required parts; SoundFX Direct Fit
1996OldsmobileAchieva2.4LL4N/ARequires 36153; If welded assembly, replace all required parts; SoundFX Direct Fit
1995BuickSkylark2.3LL4N/ARequires 36153; If welded assembly, replace all required parts; SoundFX Direct Fit
1995ChevroletCorsica2.2LL4N/ARequires 36153; If welded assembly, replace all required parts; SoundFX Direct Fit
1995OldsmobileAchieva2.3LL4N/ARequires 36153; If welded assembly, replace all required parts; SoundFX Direct Fit

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

14699700185

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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