Walker 21648 Exhaust Resonator
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Walker

Walker 21648 Exhaust Resonator

Brand Walker 21648
Body 1 Height 3.5
Body 1 Length 19
Body 1 Shape Round
Body 1 Width 3.5
Body Height 3.5
Body Length 19
Body Material Steel
Body Width 3.5
Friction Material Thickness Aluminized
Inlet Configuration Center
Inlet Quantity 1
Inlet Type 2 Bolt Welded Flange
Outlet Configuration Center
Outlet Inside Diameter 2.25
Outlet Outside Diameter 2.25
Outlet Quantity 1
Outlet Type Pipe Connection
Resonator Shape Round
Universal Or Specific Fit Direct Fit
Fits Subaru · 54 vehicles

Direct fit. Installs as a direct replacement with no modifications needed.

OE-style sound. Precise tuning helps deliver the original system's sound and flow.

Aluminized steel. Corrosion-resistant finish on a steel resonator body.

Cross-references AP Exhaust 54936, AP Exhaust 78297 and AP Exhaust 642863 for the same application. See all 10.

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Walker 21648 Exhaust Resonator

Walker 21648 is a direct-fit exhaust resonator built for Subaru applications that need OE-style sound control and steady exhaust flow. It uses a round steel body with an aluminized finish and center inlet/outlet layout for a factory-style replacement on select Subaru Legacy, Outback, Forester, Crosstrek, XV Crosstrek, and Impreza models.

Key Features

  • Direct fit exhaust resonator for select Subaru vehicles
  • Round steel body with aluminized finish for corrosion resistance
  • 2.25 in. inlet and 2.25 in. outlet sizing
  • 2-bolt welded flange inlet with pipe connection outlet
  • Center inlet and center outlet configuration
  • Designed to deliver OE-style sound and flow characteristics
  • Walker part number 21648 for catalog and cross-reference use

Product Details

Walker 21648 is engineered as an exhaust resonator replacement that follows the original system layout closely. The 19-inch round body measures 3.5 inches in height and width, with a steel construction and aluminized finish for a practical balance of fit and durability. Walker uses precise tuning methods to help maintain factory-like exhaust tone while supporting smooth exhaust flow. This part number 21648 is a direct-fit solution for Subaru owners looking to restore the original resonator function without changing the system design.

This part cross-references AP Exhaust 54936 for the same application.

Vehicle Fitment

  • Fits 2018-2019 Subaru Legacy, N/A
  • Fits 2018-2019 Subaru Outback, N/A
  • Fits 2009-2018 Subaru Forester, N/A
  • Fits 2017 Subaru Crosstrek, N/A
  • Fits 2010-2017 Subaru Legacy, N/A
  • Fits 2010-2017 Subaru Outback, N/A
  • Fits 2016 Subaru Crosstrek, N/A
  • Fits 2008-2016 Subaru Impreza, N/A
  • Fits 2013-2015 Subaru XV Crosstrek, N/A
  • Fits 2009-2013 Subaru Forester, N/A

Common Repair Uses

  • Restoring factory exhaust tone after resonator wear or damage
  • Replacing a rusted or leaking resonator section
  • Addressing exhaust drone or unwanted cabin noise
  • Repairing a Subaru exhaust system with OE-style routing
  • Replacing a welded resonator assembly on supported applications

Installation Notes

Verify inlet and outlet sizing, flange style, and center configuration before installation. This Walker resonator uses a direct-fit layout, but some Subaru applications note that if the system is welded assembly, all required parts should be replaced. Confirm the vehicle’s exhaust configuration against the listed fitment before welding or final assembly.

Quality Assurance

Walker designs this resonator to match original-system fit, performance, and sound characteristics. The part is built with OE-style tuning principles and a direct-fit configuration for the listed Subaru applications.

Related reading

This part fits 54 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelBody TypeLitersCylindersFuel TypePositionNotes
2019SubaruLegacy—2.5LH4—N/A—
2019SubaruOutback—2.5LH4—N/A—
2018SubaruForester—2.5LH4—N/AIf welded assembly, replace all required parts
2018SubaruLegacy—2.5LH4—N/A—
2018SubaruOutback—2.5LH4—N/A—
2017SubaruCrosstrek—2.0LH4GASN/A—
2017SubaruForester—2.5LH4—N/AIf welded assembly, replace all required parts
2017SubaruLegacy—2.5LH4—N/AIf welded assembly, replace all required parts
2017SubaruOutback—2.5LH4—N/AIf welded assembly, replace all required parts
2016SubaruCrosstrek—2.0LH4GASN/AIf welded assembly, replace all required parts
2016SubaruForester—2.5LH4—N/AIf welded assembly, replace all required parts
2016SubaruImprezaHatchback2.0LH4—N/AIf welded assembly, replace all required parts
2016SubaruImprezaSedan2.0LH4—N/AIf welded assembly, replace all required parts
2016SubaruLegacy—2.5LH4—N/AIf welded assembly, replace all required parts
2016SubaruOutback—2.5LH4—N/AIf welded assembly, replace all required parts
2015SubaruForester—2.5LH4—N/AIf welded assembly, replace all required parts
2015SubaruImprezaHatchback2.0LH4—N/AIf welded assembly, replace all required parts
2015SubaruImprezaSedan2.0LH4—N/AIf welded assembly, replace all required parts
2015SubaruLegacy—2.5LH4—N/AIf welded assembly, replace all required parts
2015SubaruOutback—2.5LH4—N/AIf welded assembly, replace all required parts
2015SubaruXV Crosstrek—2.0LH4GASN/AIf welded assembly, replace all required parts
2014SubaruForester—2.5LH4—N/AIf welded assembly, replace all required parts
2014SubaruImprezaHatchback2.0LH4—N/AIf welded assembly, replace all required parts
2014SubaruImprezaSedan2.0LH4—N/AIf welded assembly, replace all required parts
2014SubaruLegacy—2.5LH4—N/AIf welded assembly, replace all required parts
2014SubaruOutback—2.5LH4—N/AIf welded assembly, replace all required parts
2014SubaruXV Crosstrek—2.0LH4GASN/AIf welded assembly, replace all required parts
2013SubaruForester—2.5LH4—N/A—
2013SubaruForester—2.5LH4—N/AIf welded assembly, replace all required parts
2013SubaruImprezaHatchback2.0LH4—N/AIf welded assembly, replace all required parts
2013SubaruImprezaSedan2.0LH4—N/AIf welded assembly, replace all required parts
2013SubaruLegacy—2.5LH4—N/AIf welded assembly, replace all required parts
2013SubaruOutback—2.5LH4—N/AIf welded assembly, replace all required parts
2013SubaruXV Crosstrek—2.0LH4—N/AIf welded assembly, replace all required parts
2012SubaruForester—2.5LH4—N/A—
2012SubaruForester—2.5LH4—N/AIf welded assembly, replace all required parts
2012SubaruImprezaHatchback2.0LH4—N/AIf welded assembly, replace all required parts
2012SubaruImprezaSedan2.0LH4—N/AIf welded assembly, replace all required parts
2012SubaruLegacy—2.5LH4—N/AIf welded assembly, replace all required parts
2012SubaruOutback—2.5LH4—N/AIf welded assembly, replace all required parts
2011SubaruForester—2.5LH4—N/A—
2011SubaruForester—2.5LH4—N/AIf welded assembly, replace all required parts
2011SubaruImprezaSedan2.5LH4—N/AIf welded assembly, replace all required parts
2011SubaruLegacy—2.5LH4—N/AIf welded assembly, replace all required parts
2011SubaruOutback—2.5LH4—N/AIf welded assembly, replace all required parts
2010SubaruForester—2.5LH4—N/AIf welded assembly, replace all required parts
2010SubaruForester—2.5LH4—N/A—
2010SubaruImprezaSedan2.5LH4—N/AIf welded assembly, replace all required parts
2010SubaruLegacy—2.5LH4—N/AIf welded assembly, replace all required parts
2010SubaruOutback—2.5LH4—N/AIf welded assembly, replace all required parts
2009SubaruForester—2.5LH4—N/AIf welded assembly, replace all required parts
2009SubaruForester—2.5LH4—N/A—
2009SubaruImprezaSedan2.5LH4—N/AIf welded assembly, replace all required parts
2008SubaruImprezaSedan2.5LH4—N/AIf welded assembly, replace all required parts
Directly replaces or cross-references 10 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
AP Exhaust — 54936AP Exhaust — 78297AP Exhaust — 642863Eastern Catalytic — 50365Four Seasons — 55646286-421287-479287-5872103-523863SU8405