Walker 21394 Exhaust Muffler
OE Quality 60-Day Returns
Walker
 Quiet-Flow

Walker 21394 Exhaust Muffler

Brand Walker 21394
Universal Or Specific Fit Specific
Shape Oval
Grade Type Regular
Inlet Inside Diameter 1.75
Body Width 7.75
Inlet Quantity 1
Outlet Inside Diameter 1.75
Outlet Quantity 1
Reversible No
Tunable No
Overall Length 26
Body Height 3.25
Body Length 23
Body Material Steel
Finish Aluminized
Inlet 1 Inside Diameter 1.75
Inlet 1 Type Pipe connection
Inlet Configuration Offset
Inlet Offset 2.5
Inlet Type Pipe connection
Muffler Type Combination
Outlet 1 Inside Diameter 1.75
Outlet 1 Type Pipe connection
Outlet Configuration Offset
Outlet Type Pipe connection
Product line Quiet-Flow
Fits Ford · 3 vehicles

OE-style sound. Quiet-Flow engineering helps maintain a controlled exhaust note.

Aluminized steel. Steel body with aluminized finish for added exhaust system durability.

Specific-fit design. Built with offset pipe connections and 1.75-inch inlet and outlet sizes.

$113.44Free 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 $113.44
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 Muffler 21394

Walker Quiet-Flow muffler 21394 is a specific-fit exhaust muffler built for OE-style sound control and steady exhaust flow. It is a fitment-based replacement for classic Ford Mustang applications and uses an oval steel body with aluminized finish for a durable exhaust service part.

Key Features

  • Specific-fit exhaust muffler for direct application matching.
  • Oval steel construction with aluminized finish.
  • Offset pipe connections with 1.75-inch inlet and outlet diameters.
  • Combination muffler design for balanced exhaust performance and sound.
  • Walker Quiet-Flow product line focused on OE-style sound characteristics.

Detailed Description

This Walker 21394 muffler is engineered for drivers who want a replacement exhaust component that maintains a controlled sound profile while supporting exhaust flow. The 26-inch overall length, 23-inch body length, and 3.25-inch body height provide a compact oval layout, while the offset inlet and outlet configuration helps match specific exhaust routing requirements. Fits 1965-1966 Ford Mustang, N/A. Walker 21394 is part of the Quiet-Flow line, which is positioned around OE-style sound and fitment for popular domestic and foreign vehicles.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Is Used For

  • Replacing a worn or rusted exhaust muffler.
  • Restoring controlled exhaust sound after exhaust system wear.
  • Maintaining proper exhaust flow through a specific-fit muffler design.
  • Addressing exhaust noise from internal muffler deterioration.

Installation Notes and Tips

Verify inlet and outlet diameter, offset configuration, and overall muffler dimensions before installation. This muffler uses pipe connections and is not reversible or tunable, so exhaust routing should match the listed configuration. Fits 1965-1966 Ford Mustang, N/A.

Quality Assurance

Walker backs Quiet-Flow mufflers with a limited lifetime warranty and a 90-day Safe and Sound guarantee.

Related reading

This part fits 3 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersNotes
1966FordMustang3.3LL6Premium; Limited Lifetime Warranty; Quiet-Flow
1965FordMustang3.3LL6Premium; Limited Lifetime Warranty; Quiet-Flow
1965FordMustang2.8LL6Premium; Limited Lifetime Warranty; Quiet-Flow