Walker 21686 Exhaust Muffler
OE Quality 60-Day Returns
Walker
 Quiet-Flow SS

Walker 21686 Exhaust Muffler

Brand Walker 21686
Muffler Type Reflection
Universal Or Specific Fit Specific
Shape Oval
Grade Type Regular
Inlet Inside Diameter 2.25
Body Width 9.5
Inlet Quantity 1
Outlet Quantity 1
Reversible No
Tunable No
Overall Length 27.75
Body Height 7.5
Body Length 17
Body Material Stainless steel
Finish Aluminized
Inlet 1 Inside Diameter 2.25
Inlet 1 Type Pipe connection
Inlet Configuration Offset
Inlet Offset 2
Inlet Type Pipe connection
Outlet 1 Outside Diameter 2
Outlet 1 Type Tip
Outlet Configuration Offset
Outlet Outside Diameter 2
Outlet Type Tip
Product line Quiet-Flow SS
Fits Chevrolet · 6 vehicles

100% stainless steel. Corrosion-resistant construction for long service life.

Precision fit. OE-style replacement with superior flow.

OE-style sound. Delivers a refined exhaust note.

Cross-references AP Exhaust 2508 for the same application. See all 1.

$102.01Free 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 $102.01
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 Quiet-Flow SS Muffler for HHR

The Walker Quiet-Flow SS muffler, part number 21686, is a specific-fit exhaust muffler built for 2006-2011 Chevrolet HHR applications. It uses 100% stainless-steel construction for the body and is engineered for precision fit, steady exhaust flow, and OE-style sound control.

Key Features

  • Walker Quiet-Flow SS product line for domestic and import vehicle coverage
  • Specific-fit oval muffler for 2006-2011 Chevrolet HHR
  • 100% stainless-steel body construction
  • Reflection muffler design for controlled exhaust sound
  • Single 2.25 in. inlet with offset configuration
  • Single 2 in. outlet tip with offset configuration
  • Overall length: 27.75 in.; body length: 17 in.; body width: 9.5 in.; body height: 7.5 in.
  • Aluminized finish

Product Details

Walker Quiet-Flow SS mufflers are built around a stainless-steel construction and a fitment-focused design that supports direct replacement on the listed Chevrolet HHR application. Part number 21686 uses an oval body, offset inlet and outlet layout, and a reflection-style internal design to help maintain a controlled exhaust note while preserving flow characteristics. This makes it a practical choice for drivers looking for a replacement muffler for a 2006-2011 Chevrolet HHR with OE-style sound characteristics.

This part cross-references AP Exhaust 2508 for the same application.

Common Replacement Reasons

  • Rust or corrosion in the existing muffler body
  • Exhaust noise from a damaged or leaking muffler
  • Restricted exhaust flow from internal deterioration
  • Need for a direct-fit replacement on a Chevrolet HHR exhaust system
  • Restoring OE-style exhaust sound on 2006-2011 Chevrolet HHR models

Installation Notes and Tips

Verify inlet and outlet dimensions, offset configuration, and overall length before installation. This muffler is specific fit for the listed Chevrolet HHR application, and welded assemblies require replacement of all required related parts when applicable. Confirm the exhaust routing and connection style match the vehicle before final installation.

Quality Assurance

Walker Quiet-Flow SS mufflers are positioned as a stainless-steel exhaust replacement line with precision fit and OE-style sound characteristics. Part number 21686 is listed for 2006-2011 Chevrolet HHR applications.

Related reading

This part fits 6 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2011ChevroletHHR2.4LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2010ChevroletHHR2.4LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2009ChevroletHHR2.4LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2008ChevroletHHR2.4LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2007ChevroletHHR2.4LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2006ChevroletHHR2.4LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
AP Exhaust — 2508