Flowmaster 40 Series Delta Flow Mufflers

4.72 out of 5 stars 143 Customer Reviews

Flowmaster Super 40 Series Delta Flow mufflers go a step beyond their original 40 Series product. By precisely placing three internal baffles in the case, and welding them to exacting specifications, the 40 Series Delta Flow mufflers not only out-scavenge the originals, but they also provide superior reductions in exterior sound levels and resonance, which are transmitted through the exhaust system and into the vehicle. You get all this, plus improved torque and horsepower—and that famous Flowmaster sound!

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Flowmaster 40 Series Delta Flow Steel 2.5 Inch Muffler 942543

Muffler, Delta Flow 40 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Each

Part Number: FLO-942543

4.6 out of 5 stars ( 10 )

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Flowmaster 40 Series Delta Flow Steel 2.5 Inch Muffler 942540

Muffler, Delta Flow 40 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Each

Part Number: FLO-942540

4.8 out of 5 stars ( 10 )

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Flowmaster 40 Series Delta Flow Steel 2.5 Inch Muffler 942541

Muffler, Delta Flow 40 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Each

Part Number: FLO-942541

4.57 out of 5 stars ( 14 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow Steel 2 Inch Muffler 942041

Muffler, Delta Flow 40 Series, 2 in. Inlet/2 in. Outlet, Steel, Black, Each

Part Number: FLO-942041

5.0 out of 5 stars ( 10 )

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Flowmaster 40 Series Delta Flow Steel 3 Inch Muffler 943040

Muffler, Delta Flow 40 Series, 3 in. Inlet/3 in. Outlet, Steel, Black, Each

Part Number: FLO-943040

4.0 out of 5 stars ( 5 )

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Flowmaster 40 Series Delta Flow Steel 3 Inch Muffler 943043

Muffler, Delta Flow 40 Series, 3 in. Inlet/3 in. Outlet, Steel, Black, Each

Part Number: FLO-943043

4.67 out of 5 stars ( 3 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow 409 Stainless Steel 2.5 Inch Muffler 842541

Muffler, Delta Flow 40 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Stainless Steel, Black, Each

Part Number: FLO-842541

4.8 out of 5 stars ( 5 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow Steel 2.5 Inch Muffler 942544

Muffler, Delta Flow 40 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Each

Part Number: FLO-942544

Not Yet Reviewed

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Flowmaster 40 Series Delta Flow Steel 2 Inch Muffler 942040

Muffler, Delta Flow 40 Series, 2 in. Inlet/2 in. Outlet, Steel, Black, Each

Part Number: FLO-942040

5.0 out of 5 stars ( 3 )

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Flowmaster 40 Series Delta Flow Steel 2.25 Inch Muffler 942441

Muffler, Delta Flow 40 Series, 2 1/4 in. Inlet/2 1/4 in. Outlet, Steel, Black, Each

Part Number: FLO-942441

4.33 out of 5 stars ( 6 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow Steel 2.5 Inch Muffler 942542

Muffler, Delta Flow 40 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Each

Part Number: FLO-942542

5.0 out of 5 stars ( 8 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow Steel 2 Inch Muffler 942042

Muffler, Delta Flow 40 Series, 2 in. Inlet/2 in. Outlet, Steel, Black, Each

Part Number: FLO-942042

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow Steel 2 Inch Muffler 942043

Muffler, Delta Flow 40 Series, 2 in. Inlet/2 in. Outlet, Steel, Black, Each

Part Number: FLO-942043

4.6 out of 5 stars ( 5 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow Steel 2.25 Inch Muffler 942440

Muffler, Delta Flow 40 Series, 2 1/4 in. Inlet/2 1/4 in. Outlet, Steel, Black, Each

Part Number: FLO-942440

5.0 out of 5 stars ( 7 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow Steel 2.5 Inch Muffler 9425400

Muffler, Delta Flow 40 Series, 2 1/2 in. Inlet/Dual 2 1/2 in. Outlet, Steel, Black, Each

Part Number: FLO-9425400

4.5 out of 5 stars ( 4 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow 409 Stainless Steel 3 Inch Muffler 843041

Muffler, Delta Flow 40 Series, 3 in. Inlet/3 in. Outlet, Stainless Steel, Black, Each

Part Number: FLO-843041

4.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow Steel 2.25 Inch Muffler 942442

Muffler, Delta Flow 40 Series, 2 1/4 in. Inlet/2 1/4 in. Outlet, Steel, Black, Each

Part Number: FLO-942442

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow Steel 3 Inch Muffler 943042

Muffler, Delta Flow 40 Series, 3 in. Inlet/3 in. Outlet, Steel, Black, Each

Part Number: FLO-943042

4.5 out of 5 stars ( 6 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow Steel 3 Inch Muffler 943041

Muffler, Delta Flow 40 Series, 3 in. Inlet/3 in. Outlet, Steel, Black, Each

Part Number: FLO-943041

4.83 out of 5 stars ( 6 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow Steel 3 Inch Muffler 9430422

Muffler, Delta Flow 40 Series, 3 in. Inlet/Dual 2 1/4 in. Outlet, Steel, Black, Each

Part Number: FLO-9430422

5.0 out of 5 stars ( 5 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow 409 Stainless Steel 2.5 Inch Muffler 842543

Muffler, Delta Flow 40 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Stainless Steel, Black, Each

Part Number: FLO-842543

4.5 out of 5 stars ( 4 )

Estimated Ship Date: Aug 7, 2025 if ordered today

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Estimated Ship Date: Aug 7, 2025 if ordered today

Flowmaster 40 Series Delta Flow Steel 2.25 Inch Muffler 942443

Muffler, Delta Flow 40 Series, 2 1/4 in. Inlet/2 1/4 in. Outlet, Steel, Black, Each

Part Number: FLO-942443

4.89 out of 5 stars ( 9 )

Estimated Ship Date: Aug 8, 2025 if ordered today

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Estimated Ship Date: Aug 8, 2025 if ordered today

Need It Sooner? We recommend these similar substitute parts:

Summit Racing™ 2-Chamber Performance Steel 2.25 Inch Muffler SUM-638251

4.75 out of 5 stars ( 27 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow 409 Stainless Steel 3 Inch Muffler 8430402

Muffler, Delta Flow 40 Series, 3 in. Inlet/Dual 2 1/2 in. Outlet, Stainless Steel, Black, Each

Part Number: FLO-8430402

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow Steel 2.5 Inch Muffler 9425432

Muffler, Delta Flow 40 Series, 2 1/2 in. Inlet/Dual 2 1/4 in. Outlet, Steel, Black, Each

Part Number: FLO-9425432

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Today

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Flowmaster 40 Series Delta Flow Steel 2.5 Inch Muffler 9425422

Muffler, Delta Flow 40 Series, 2 1/2 in. Inlet/Dual 2 1/4 in. Outlet, Steel, Black, Each

Part Number: FLO-9425422

Not Yet Reviewed

Estimated Ship Date: Aug 6, 2025 if ordered today

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Estimated Ship Date: Aug 6, 2025 if ordered today

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