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Flowmaster Exhaust: Mufflers, Systems, Tips & More

For over 25 years, the Flowmaster tone has been thundering through streets and on tracks around the world! Housed in two state-of-the-art facilities, Flowmaster uses...

For over 25 years, the Flowmaster tone has been thundering through streets and on tracks around the world! Housed in two state-of-the-art facilities, Flowmaster uses premium materials along with extensive research and design to produce advanced, dyno-tuned exhaust systems and components that deliver power gains with an unmistakable sound. Some of the most distinct exhaust systems include the Flowmaster 40 Series and American Thunder mufflers, but there are plenty more choices—whether you want your ride to sound wild or mild, Flowmaster has the high performance exhaust parts you need.

For over 25 years, the Flowmaster tone has been thundering through streets and on tracks around the world! Housed in two state-of-the-art facilities, Flowmaster uses premium materials along with extensive research and design to produce advanced, dyno-tuned exhaust systems and components that deliver power gains with an unmistakable sound. Some of the most distinct exhaust systems include the Flowmaster 40 Series and American Thunder mufflers, but there are plenty more choices—whether you want your ride to sound wild or mild, Flowmaster has the high performance exhaust parts you need.

Showing In Stock Items. Show All 878 Items.

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Results 1 - 25 of 823

Flowmaster 40 Series Steel 2.5 Inch Muffler 42541

Flowmaster 40 Series Steel 2.5 Inch Muffler 42541

Flowmaster 40 Series Steel 2.5 Inch Muffler 42541

Muffler, American Thunder 40 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Each

Part Number: FLO-42541

4.75 out of 5 stars ( 87 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster American Thunder Exhaust Systems 17119

Flowmaster American Thunder Exhaust Systems 17119

Flowmaster American Thunder Exhaust Systems 17119

Exhaust System, American Thunder, Dual, Crossmember Back, Split Rear, 2.5 in. Dia., w/H-Pipe and Mufflers, Steel, Aluminized, GM, A-Body, Kit

Part Number: FLO-17119

4.27 out of 5 stars ( 37 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster Universal Catalytic Converters 2000130

Flowmaster Universal Catalytic Converters 2000130

Flowmaster Universal Catalytic Converters 2000130

Catalytic Converter, Stainless Steel Case, Metallic Substrate, 3 in. Slip Fit Inlet/Outlet, 8 in. Length

Part Number: FLO-2000130

4.8 out of 5 stars ( 15 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster FlowFX 409 Stainless Steel 2.5 Inch Muffler 71416

Flowmaster FlowFX 409 Stainless Steel 2.5 Inch Muffler 71416

Flowmaster FlowFX 409 Stainless Steel 2.5 Inch Muffler 71416

Muffler, FlowFX Series, 2.5 in. Inlet/2.5 in. Outlet, Stainless Steel, Natural, Round Body, Each

Part Number: FLO-71416

4.76 out of 5 stars ( 66 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster FlowFX 409 Stainless Steel 2.5 Inch Muffler 71226

Flowmaster FlowFX 409 Stainless Steel 2.5 Inch Muffler 71226

Flowmaster FlowFX 409 Stainless Steel 2.5 Inch Muffler 71226

Muffler, FlowFX Series, 2.5 in. Inlet, 2.5 in. Outlet, 409 Stainless Steel, Natural Finish, Each

Part Number: FLO-71226

4.8 out of 5 stars ( 76 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster American Thunder Exhaust Systems for 1967-1972 C10 PICKUP, C15/C1500 PICKUP - 817654

Flowmaster American Thunder Exhaust Systems for 1967-1972 C10 PICKUP, C15/C1500 PICKUP - 817654

Flowmaster American Thunder Exhaust Systems for 1967-1972 C10 PICKUP, C15/C1500 PICKUP - 817654

Exhaust System, American Thunder, Header-back, Dual, Stainless, Split Rear/Split Side Exit, Chevy, GMC, Kit

Part Number: FLO-817654

4.56 out of 5 stars ( 18 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster 50 Series Delta Flow Steel 2.5 Inch Muffler 942551

Flowmaster 50 Series Delta Flow Steel 2.5 Inch Muffler 942551

Flowmaster 50 Series Delta Flow Steel 2.5 Inch Muffler 942551

Muffler, Delta Flow 50 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Each

Part Number: FLO-942551

4.84 out of 5 stars ( 37 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster American Thunder Exhaust Systems 817940

Flowmaster American Thunder Exhaust Systems 817940

Flowmaster American Thunder Exhaust Systems 817940

Exhaust System, American Thunder, Crossmember back, Dual, Stainless, Split Rear/Split Side Exit, Chevy, GMC, Kit

Part Number: FLO-817940

Not Yet Reviewed

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster 40 Series Steel 3 Inch Muffler 43041

Flowmaster 40 Series Steel 3 Inch Muffler 43041

Flowmaster 40 Series Steel 3 Inch Muffler 43041

Muffler, Flowmaster 40 Series, 3 in. Offset Inlet/3 in. Center Outlet, Steel, Black, Each

Part Number: FLO-43041

4.83 out of 5 stars ( 47 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster American Thunder Exhaust Systems for 1967-1968 CAMARO, FIREBIRD - 17129

Flowmaster American Thunder Exhaust Systems for 1967-1968 CAMARO, FIREBIRD - 17129

Flowmaster American Thunder Exhaust Systems for 1967-1968 CAMARO, FIREBIRD - 17129

Exhaust System, American Thunder, Header-Back, Steel, Aluminized, Chevy, Pontiac, Kit

Part Number: FLO-17129

4.23 out of 5 stars ( 22 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster Universal Catalytic Converters 2000125

Flowmaster Universal Catalytic Converters 2000125

Flowmaster Universal Catalytic Converters 2000125

Catalytic Converter, Stainless Steel Case, Metallic Substrate, 2.5 in. Slip Fit Inlet/Outlet, 8 in. Long, Each

Part Number: FLO-2000125

4.85 out of 5 stars ( 20 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster 50 Series Delta Flow 409 Stainless Steel 2.5 Inch Muffler 842553

Flowmaster 50 Series Delta Flow 409 Stainless Steel 2.5 Inch Muffler 842553

Flowmaster 50 Series Delta Flow 409 Stainless Steel 2.5 Inch Muffler 842553

Muffler, Delta Flow 50 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Stainless Steel, Black, Each

Part Number: FLO-842553

4.65 out of 5 stars ( 20 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster FlowFX 409 Stainless Steel 3 Inch Muffler 71229

Flowmaster FlowFX 409 Stainless Steel 3 Inch Muffler 71229

Flowmaster FlowFX 409 Stainless Steel 3 Inch Muffler 71229

Muffler, FlowFX Series, 3 in. Offset Inlet/3 in. Center Outlet, Reversible, Stainless Steel, Natural, Each

Part Number: FLO-71229

4.61 out of 5 stars ( 71 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster American Thunder Exhaust Systems 17742

Flowmaster American Thunder Exhaust Systems 17742

Flowmaster American Thunder Exhaust Systems 17742

Exhaust System, American Thunder, Header-back, Dual, Steel, Aluminized, Split Rear Exit, Chevy, GMC, Kit

Part Number: FLO-17742

4.2 out of 5 stars ( 10 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster FlowFX 409 Stainless Steel 3 Inch Muffler 71419

Flowmaster FlowFX 409 Stainless Steel 3 Inch Muffler 71419

Flowmaster FlowFX 409 Stainless Steel 3 Inch Muffler 71419

Mufflers, FlowFX, Round Case, Stainless Steel, Natural, Single 3.00 in. Center Inlet/Outlet, 20.000 in. Overall Length, Each

Part Number: FLO-71419

4.77 out of 5 stars ( 39 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster Super 10 Series 409 Stainless Steel 2.5 Inch Muffler 842515

Flowmaster Super 10 Series 409 Stainless Steel 2.5 Inch Muffler 842515

Flowmaster Super 10 Series 409 Stainless Steel 2.5 Inch Muffler 842515

Muffler, Super 10 Series, 2.5 in. Inlet/2.5 in. Outlet, Stainless Steel, Black, Each

Part Number: FLO-842515

4.85 out of 5 stars ( 111 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster 40 Series Steel 2.5 Inch Muffler 42543

Flowmaster 40 Series Steel 2.5 Inch Muffler 42543

Flowmaster 40 Series Steel 2.5 Inch Muffler 42543

Muffler, 40 Series, 2 1/2 in. Offset Inlet, 2 1/2 in. Offset Outlet, Chambered, Steel, Black, Each

Part Number: FLO-42543

4.9 out of 5 stars ( 42 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster Pipe Kits 17107

Flowmaster Pipe Kits 17107

Flowmaster Pipe Kits 17107

Exhaust System, Header-Back, Steel, Aluminized, H-Pipe, Buick, Chevy, Oldsmobile, Pontiac, A-Body, Kit

Part Number: FLO-17107

4.47 out of 5 stars ( 17 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster American Thunder Exhaust Systems for 1967-1972 F-100, F-250, F-350 - 817938

Flowmaster American Thunder Exhaust Systems for 1967-1972 F-100, F-250, F-350 - 817938

Flowmaster American Thunder Exhaust Systems for 1967-1972 F-100, F-250, F-350 - 817938

Exhaust System, American Thunder, Header-Back, Stainless Steel, Ford, Standard Cab, Kit

Part Number: FLO-817938

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster Outlaw Series Exhaust Systems for 2019-2026 1500 - 817936

Flowmaster Outlaw Series Exhaust Systems for 2019-2026 1500 - 817936

Flowmaster Outlaw Series Exhaust Systems for 2019-2026 1500 - 817936

Exhaust system, Outlaw Series, Cat-Back, Stainless Steel, Ram, Kit

Part Number: FLO-817936

5.0 out of 5 stars ( 5 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster FlowFX Exhaust Systems for 2014-2024 2500, 3500 - 717930

Flowmaster FlowFX Exhaust Systems for 2014-2024 2500, 3500 - 717930

Flowmaster FlowFX Exhaust Systems for 2014-2024 2500, 3500 - 717930

Exhaust System, Cat-Back, FlowFX, 409 Stainless Steel, Single Passenger Side Exit, Black Ceramic Tip, Ram, Kit

Part Number: FLO-717930

4.5 out of 5 stars ( 4 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster Stainless Steel American Thunder Exhaust Systems for 1955-1957 BEL AIR, ONE-FIFTY SERIES, TWO-TEN SERIES - 817174

Flowmaster Stainless Steel American Thunder Exhaust Systems for 1955-1957 BEL AIR, ONE-FIFTY SERIES, TWO-TEN SERIES - 817174

Flowmaster Stainless Steel American Thunder Exhaust Systems for 1955-1957 BEL AIR, ONE-FIFTY SERIES, TWO-TEN SERIES - 817174

Exhaust System, Force II, Header-Back, Stainless Steel, Natural, H-Pipe, Stainless Tips, Chevy, Kit

Part Number: FLO-817174

4.13 out of 5 stars ( 8 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster Super 10 Series 409 Stainless Steel 3 Inch Muffler 843015

Flowmaster Super 10 Series 409 Stainless Steel 3 Inch Muffler 843015

Flowmaster Super 10 Series 409 Stainless Steel 3 Inch Muffler 843015

Muffler, Super 10 Series, 3.0 in. Center Inlet/3.0 in. Center Outlet, Chambered, Stainless Steel, Black, Each

Part Number: FLO-843015

4.87 out of 5 stars ( 69 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster American Thunder Exhaust Systems for 1963 1000 SERIES, 1963-1966 C10 PICKUP - 817937

Flowmaster American Thunder Exhaust Systems for 1963 1000 SERIES, 1963-1966 C10 PICKUP - 817937

Flowmaster American Thunder Exhaust Systems for 1963 1000 SERIES, 1963-1966 C10 PICKUP - 817937

Exhaust System, American Thunder, Header-Back, 409 Stainless Steel, 1963-66 Chevy/GMC, C10, Long and Short Bed, Straight /Side/Down Outlets, Kit

Part Number: FLO-817937

4.25 out of 5 stars ( 4 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

Flowmaster FlowFX Exhaust Systems 717873

Flowmaster FlowFX Exhaust Systems 717873

Flowmaster FlowFX Exhaust Systems 717873

Exhaust System, Cat-back, FlowFX, 409 Stainless Steel, Single Exit, Chevrolet, GMC, Kit

Part Number: FLO-717873

5.0 out of 5 stars ( 6 )

Estimated Ship Date: Monday 3/30/2026 if shipped by air

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Estimated Ship Date: Monday 3/30/2026 if shipped by air

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