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  • SoundFX for part# 21489.
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Product Details

Walker Exhaust Parts

SoundFX™ Aluminized Steel Direct Fit Exhaust Muffler (18959) by Walker®. Optional. Emissions: EPA compliant. This muffler is the right choice if you opt for quality acoustics and performance. Walker offers 100% aluminized steel SoundFX™ Mufflers with direct fit and universal fit options available, both designed to maintain a quality appearance and agreeable exhaust tone.

Notes: SoundFX for part# 21489.

Walker - Quiet-Flow MufflersWalker - VideosWalker - About


Emissions: EPA compliant
Muffler Series: SoundFX™
Muffler Body Height: 4.25"
Muffler Body Width: 9.75"
Muffler Body Length: 20"
Muffler Overall Length: 26.5"
Muffler Body Material: Aluminized Steel
Muffler Body Shape: Oval
Muffler Inlet-Outlet Configuration: Center - Offset
Muffler Outlet Diameter: 2.25"
Muffler Reversibility: No
Muffler Type: Combination
Inlet Quantity: 1
Outlet Quantity: 1
Inlet Connection Type: 2 Bolt Welded Flange
Outlet Connection Type: Pipe Connection
Connection Type: 2 Bolt Welded Flange
Outlet Diameter Designation: Inside Diameter


  • Designed to deliver ultimate performance and pleasing sound quality
  • OE-equivalent direct-fit design
  • 100% aluminized material
  • Reinforced bracketed heads improve structural support and stability
  • Mechanical interior joints help eliminate distortion and breakage
  • Spun-locked heads protect against rupture
  • Two tubes / two partitions internal design
  • Easy installation with no modifications required

The SoundFX Muffler by Walker is a quality and cost-effective repair alternative. These mufflers are available in both direct-fit or universal configurations. Direct-fit mufflers are designed as a direct OE replacement and constructed specially for your car and perfectly match the OE muffler in size, shape and hanger placement. This configuration allows for easy, worry-free installation. Universal fit muffler is a more economical option as it is not vehicle-specific. It is the same quality as the direct fit SoundFX Muffler, but may require some modifications or changes to install on your vehicle.

Each SoundFX Muffler is manufactured from 100% aluminized steel for greater durability and quality appearance. It features reinforced bracketed heads that help improve structural support and stability. One of the reasons of premature muffler failure is rupture from backfires. To provide effective resistance from backfire and exhaust gas leakage, SoundFX Muffler heads are spun-locked to the shell. Internal tubes are mechanically joined to prevent spot weld breakage and flow tube deformation.

Walker® is the world's leading manufacturer of automotive exhaust systems and emission control products for the replacement and OE markets. It offers complete engine-to-tailpipe exhaust solutions and exploits modern emission control technologies that fully satisfy the needs of the automotive industry. Walker has introduced a long line of innovations that revolutionized the market and set new standards for quality and durability. The louvered tube, stainless steel muffler, and forerunners of today's catalytic converters were the industry 'firsts' developed by Walker. It is also the first aftermarket manufacturer that offered a Limited Lifetime Warranty for the professional installer. Walker®, an industry leader in emissions control products, offers a complete line-up to meet all customer needs! World-class, engine-to-tailpipe exhaust solutions for domestic and import vehicles. Walker has everything from brackets and hangers, to clamps and gaskets - all the accessories you need to do the complete exhaust job. Walker is your one-stop exhaust shop, offering a full line of accessories.

Part Number:

Warranty Information

Limited Lifetime Warranty

Walker warrants qualifying exhaust products against defects and wear-out when used on private passenger cars and light trucks under normal operating conditions for as long as such original purchaser owns the vehicle on which they were originally installed.

Tenneco's obligation under this warranty is limited to replacement of the worn-out or defective product with the same product in accordance with this warranty. Cost of removal and installation are not included, and any incidental and consequential damages are excluded under this warranty, regardless of when the failure occurs. This warranty has no cash value. This warranty does not apply to products which have been modified, improperly applied or installed on vehicles used for commercial or racing purposes.

To make a claim under this warranty, return the worn-out or defective product with the dated original receipt to the dealer or retailer from whom it was purchased or to a Tenneco dealer for verification and exchange under this warranty.

This warranty gives you specific legal rights, and you may also have other rights, which vary from state to state. Any implied warranties you may have under state law are limited to the same duration as this warranty. Some states do not allow limitations on how long an implied warranty lasts or do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations and exclusion may not apply to you.

Walker® CalCat® Converters covered by 5-Year / 50,000 Miles Emissions Warranty and Warranty on Structural Components

Walker® Ultra® Converters covered by 25,000 Miles Emissions Warranty and 5 Years / 50,000 miles Warranty on Structural Components

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

Vehicle Fitment

Jeep Cherokee
2001 Jeep Cherokee
2000 Jeep Cherokee
  • 4.0L With California Emission
2000 Jeep Cherokee
  • 4.0L
  • Fits Models Manufactured after January, 20th
  • Fits Models with California Emission

Product Reviews


Every Customer can leave a review about our service and the product that was purchased. In order to leave your review for your new product, please follow the link in the email you receive after completing your purchase. You can rate appearance, ease of installation, price/value and product quality.

Walker® - SoundFX™ Direct Fit Exhaust Muffler
Walker® 18959 - SoundFX™ Aluminized Steel Direct Fit Exhaust Muffler
Average Rating: 4.3 of 5
4.3 of 5
Awesome Sound
Walker® - SoundFX™ Aluminized Steel Oval Direct-Fit Exhaust Muffler
If you want a great stock sound but deeper for your 4.0 Jeep Cherokee buy this. Even with cat removed very nice tone and hardly any cab noise.
JPosted by (Paragould, AR) /
Was this review helpful for you? Yes

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