Walker 21503 Exhaust Muffler - Left
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Walker
 Quiet-Flow SS

Walker 21503 Exhaust Muffler - Left

Brand Walker 21503
Position Left
Inlet Outside Diameter 2
Universal Or Specific Fit Specific
Shape Oval
Grade Type Regular
Body Width 9
Inlet Quantity 1
Reversible No
Tunable No
Overall Length 28.5
Body Height 7
Body Length 14
Body Material Stainless steel
Finish Aluminized
Inlet 1 Outside Diameter 2
Inlet 1 Type Pipe connection
Inlet Configuration Offset
Inlet Offset 2.625
Inlet Type Pipe connection
Muffler Type Combination
Outlet 1 Outside Diameter 2.25
Outlet 1 Type Tip
Outlet 2 Outside Diameter 2.25
Outlet Configuration Offset
Outlet Outside Diameter 2.25
Outlet Quantity 2
Outlet Type Tip
Product line Quiet-Flow SS
Fits Pontiac · 6 vehicles

100% stainless-steel construction. Resists corrosion for long-term durability.

Precision fit. Helps make installation straightforward with OE-style sound.

Quiet-Flow SS. Walker’s muffler line delivers superior flow in a broad-market design.

Cross-references Anchor 2242 and AP Exhaust 24006 for the same application. See all 2.

$131.03Free 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.

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Step 2 — Quantity
Order total $131.03
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 Grand Prix

Walker Quiet-Flow SS 21503 is a specific-fit exhaust muffler built for the 2003-2008 Pontiac Grand Prix, left position, with dual exhaust. It uses 100% stainless-steel construction for the body and is shaped as an oval combination muffler with OE-style sound characteristics and precision fit.

Key Features

  • Specific-fit exhaust muffler for the 2003-2008 Pontiac Grand Prix, left
  • Walker Quiet-Flow SS 21503 part number for direct application lookup
  • 100% stainless-steel body construction
  • Oval combination muffler design
  • 2-inch inlet with offset configuration
  • Dual 2.25-inch outlet tips with offset outlet configuration
  • Aluminized finish
  • Overall length: 28.5 inches
  • Body dimensions: 14 inches long, 9 inches wide, 7 inches high

Product Details

The Walker Quiet-Flow SS line focuses on stainless-steel durability, fit accuracy, and controlled exhaust tone for domestic and import vehicles. This Walker Quiet-Flow SS 21503 muffler is configured with a 2-inch pipe connection inlet, a 2.625-inch inlet offset, and dual 2.25-inch tip outlets to match the listed Grand Prix exhaust layout. For buyers searching for a Pontiac Grand Prix left muffler replacement, Walker 21503 provides a direct-fit option with the dimensions and outlet configuration needed for the specified vehicle application.

This part cross-references Anchor 2242 and AP Exhaust 24006 for the same application.

What It Helps Address

  • Exhaust noise from a worn or damaged muffler
  • Corrosion-related muffler replacement needs
  • Fitment issues on a 2003-2008 Pontiac Grand Prix, left
  • Restoring OE-style exhaust sound after muffler failure
  • Replacing a welded assembly when the required exhaust section is serviced

Installation Notes

Fits 2003-2008 Pontiac Grand Prix, left. Confirm inlet and outlet diameters, offset placement, and overall muffler length against the existing exhaust before installation. This muffler uses a specific-fit configuration and is not reversible or tunable. If the original system is welded, replace all required parts in the affected section to maintain proper alignment and sealing.

Quality Assurance

Walker Quiet-Flow SS mufflers are built with stainless-steel construction and OE-style sound tuning for consistent replacement performance. The listed fitment notes include Limited Lifetime Warranty coverage for the 2003-2008 Pontiac Grand Prix application.

Related reading

This part fits 6 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2008PontiacGrand Prix3.8LV6LeftPremium; with Dual Exhaust; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2007PontiacGrand Prix3.8LV6LeftPremium; with Dual Exhaust; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2006PontiacGrand Prix3.8LV6LeftPremium; with Dual Exhaust; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2005PontiacGrand Prix3.8LV6LeftPremium; with Dual Exhaust; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2004PontiacGrand Prix3.8LV6LeftPremium; with Dual Exhaust; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2003PontiacGrand Prix3.8LV6LeftPremium; with Dual Exhaust; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
Directly replaces or cross-references 2 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Anchor — 2242AP Exhaust — 24006