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Walker 21758 Exhaust MufflerOE Quality 60-Day Returns
Part #: 21758

Walker 21758 Exhaust Muffler

Quiet-Flow SS
⚙️ 8 vehicles fit this part
🔍
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$138.06Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
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✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
✅OE Direct Replacement — Bolt-on fit, no modifications needed
📦Quiet-Flow SS
🚗Fitment: Mazda, 3
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST
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Walker 21758 Exhaust Muffler
BrandWalker
Part Number21758
PositionQuiet-Flow SS
FinishNatural
Universal Or Specific FitSpecific
ShapeOval
Grade TypeRegular
Inlet Inside Diameter2
Body Width11
Inlet Quantity1
Outlet Inside Diameter1.75
ReversibleNo
TunableNo
Overall Length26
Body Height5.5
Body Length22
Body MaterialStainless steel
Inlet 1 Inside Diameter2
Inlet 1 TypePipe connection
Inlet ConfigurationOffset
Inlet Offset3.5
Inlet TypePipe connection
Muffler TypeCombination
Outlet 1 Inside Diameter1.75
Outlet 1 TypePipe connection
Outlet 2 Inside Diameter1.75
Outlet 2 TypePipe connection
Outlet ConfigurationDual
Outlet Quantity2
Outlet TypePipe connection

This part fits 8 vehicles. Search below:

YearMakeModelSubmodelLitersCylindersPositionNotes
2013Mazda32.5LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2013Mazda3Mazdaspeed2.3LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2012Mazda32.5LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2012Mazda3Mazdaspeed2.3LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2011Mazda32.5LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2011Mazda3Mazdaspeed2.3LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2010Mazda32.5LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS
2010Mazda3Mazdaspeed2.3LL4N/APremium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

401475389953900ST1253S

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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