1991 Mufflers - 4.00 Outlet Diameter (in.) - In Stock Filter Options - Vendor In Stock Filter Options - Free Shipping on Orders Over $109 at Summit Racing

Dynomax Ultra Flo Welded Round Steel 4 Inch Muffler 17537

Muffler, Ultra Flo Welded, 4 in. Inlet/4 in. Outlet, Stainless Steel, Each

Part Number: WLK-17537

5.0 out of 5 stars ( 9 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Walker Heavy-Duty Steel 4 Inch Muffler 22899

Walker Heavy Duty Muffler

Part Number: WLK-22899

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

AP Exhaust TruckEx Steel 4 Inch Muffler 3666

Muffler, TruckEx, Steel, Aluminized, Blue Bird, Each

Part Number: APH-3666

Not Yet Reviewed

Estimated Ship Date: Mar 13, 2026 if ordered today

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Estimated Ship Date: Mar 13, 2026 if ordered today

AP Exhaust TruckEx Steel 3.5 Inch Muffler 3716

Muffler, TruckEx, Steel, Aluminized, Genesis Transit, International, Each

Part Number: APH-3716

Not Yet Reviewed

Estimated Ship Date: Mar 12, 2026 if ordered today

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Estimated Ship Date: Mar 12, 2026 if ordered today

AP Exhaust TruckEx Steel 4 Inch Muffler 3710

Muffler, TruckEx, Steel, Aluminized, Chevy, L6, V8, Each

Part Number: APH-3710

Not Yet Reviewed

Estimated Ship Date: Mar 12, 2026 if ordered today

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Estimated Ship Date: Mar 12, 2026 if ordered today

AP Exhaust TruckEx Steel 4 Inch Muffler 3669

Muffler, TruckEx, Steel, Aluminized, Ford, Each

Part Number: APH-3669

Not Yet Reviewed

Estimated Ship Date: Mar 13, 2026 if ordered today

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Estimated Ship Date: Mar 13, 2026 if ordered today

Walker School Bus Steel 2.75 Inch Muffler 22231

Muffler, Steel, Aluminized, Dual 2.75 in. Inlets, 4 in. Outlet, International, Each

Part Number: WLK-22231

Not Yet Reviewed

Estimated Ship Date: Mar 16, 2026 if ordered today

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Estimated Ship Date: Mar 16, 2026 if ordered today

AP Exhaust TruckEx Steel 4 Inch Muffler 3632

Muffler, TruckEx, Steel, Aluminized, Chevy, Ford, International, Thomas, Each

Part Number: APH-3632

Not Yet Reviewed

Estimated Ship Date: Mar 13, 2026 if ordered today

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Estimated Ship Date: Mar 13, 2026 if ordered today

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Walker Heavy-Duty Steel 4 Inch Muffler 22004

5 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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AP Exhaust TruckEx Steel 3.5 Inch Muffler 3916

Muffler, TruckEx, Steel, Aluminized, International, L6, Each

Part Number: APH-3916

Not Yet Reviewed

Estimated Ship Date: Mar 13, 2026 if ordered today

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Estimated Ship Date: Mar 13, 2026 if ordered today

AP Exhaust TruckEx Steel 3.5 Inch Muffler 3917

Muffler, TruckEx, Steel, Aluminized, International, V8, Each

Part Number: APH-3917

Not Yet Reviewed

Estimated Ship Date: Mar 13, 2026 if ordered today

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Estimated Ship Date: Mar 13, 2026 if ordered today

AP Exhaust TruckEx Steel 3.5 Inch Muffler 3703

AP Exhaust TruckEx Steel 3.5 Inch Muffler 3703

Muffler, TruckEx, Steel, Aluminized, International, Each

Part Number: APH-3703

Not Yet Reviewed

Estimated Ship Date: Mar 13, 2026 if ordered today

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Estimated Ship Date: Mar 13, 2026 if ordered today

AP Exhaust TruckEx Steel 2.75 Inch Muffler 3610

Muffler, TruckEx, Steel, Aluminized, International, L6, V8 Diesel, Each

Part Number: APH-3610

Not Yet Reviewed

Estimated Ship Date: Mar 13, 2026 if ordered today

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Estimated Ship Date: Mar 13, 2026 if ordered today