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Flowmaster American Thunder Exhaust Systems

4.37 out of 5 stars 551 Customer Reviews

Flowmaster American Thunder exhaust systems are designed with the latest exhaust technology available--resulting in improved acceleration, passing power, and fuel m
Flowmaster American Thunder exhaust systems are designed with the latest exhaust technology available--resulting in improved acceleration, passing power, and fuel mileage. A key to these performance upgrades is Flowmaster's use of mandrel-bent tubing, which allows superior exhaust gas flow. The systems also feature mufflers (single or dual) that deliver plenty of the rich Flowmaster sound you expect. Components are built from stainless steel or aluminized steel; and some models include tips. American Thunder exhausts are available in more than a hundred configurations for fitment on specific truck and car application
Flowmaster American Thunder exhaust systems are designed with the latest exhaust technology available--resulting in improved acceleration, passing power, and fuel mileage. A key to these performance upgrades is Flowmaster's use of mandrel-bent tubing, which allows superior exhaust gas flow. The systems also feature mufflers (single or dual) that deliver plenty of the rich Flowmaster sound you expect. Components are built from stainless steel or aluminized steel; and some models include tips. American Thunder exhausts are available in more than a hundred configurations for fitment on specific truck and car applications.

Results 1 - 23 of 23

Exhaust System, American Thunder, Cat-Back, Dual-Outlet, Stainless Steel, Dodge, Hemi Gen III, Kit

Part Number: FLO-817952

Not Yet Reviewed

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-back, Single In/Dual Out, Stainless Steel, Natural, Split Rear/Split Side Exit, Chevy, GMC, 6.2L, Kit

Part Number: FLO-817602

3.5 out of 5 stars ( 4 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-back, Stainless, Natural, Split Rear/Split Side Exit, Ram, 5.7L

Part Number: FLO-817699

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder Back Half, Rear Axle-back, Dual, Stainless Steel, Rear Exit, Chevy, 3.6L, Kit

Part Number: FLO-817743

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-back, Stainless Steel, Natural, Polished Tip, Ford, 1.6L, Kit

Part Number: FLO-817784

Not Yet Reviewed

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Axle Back, 3.0 in, Stainless Steel, Split Rear, Polished Tip, Chevy, V8, Kit

Part Number: FLO-817744

4.25 out of 5 stars ( 4 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-Back, Stainless Steel, Split Rear Exit, Ram, 6.4L, Kit

Part Number: FLO-817709

4.75 out of 5 stars ( 4 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-back, Single, Stainless Steel, Natural, Rear Exit, Jeep, 3.6L, 3.8L, Kit

Part Number: FLO-817674

4.2 out of 5 stars ( 10 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-Back, Split Rear/Side, Stainless Steel, Natural, Ford, 2.7, 3.5, 5.0L

Part Number: FLO-817725

4.71 out of 5 stars ( 7 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-back, Stainless Steel, Natural, Toyota, 4.6L, 5.7L, Kit

Part Number: FLO-817664

Not Yet Reviewed

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-back, Single In/Dual Out, Stainless, Natural, Chevy, GMC, 5.3L, Kit

Part Number: FLO-817669

4.07 out of 5 stars ( 15 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, Cat-back, American Thunder, 409 Stainless Steel, Dual Exit, Ram, Kit

Part Number: FLO-817932

Not Yet Reviewed

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-Back, Split Rear, Stainless Steel, Natural, Chrysler, Dodge, 3.6L, Kit

Part Number: FLO-817741

1.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-back, Dual, Stainless Steel, Natural, Split Rear Exit, Dodge, 5.7L, Kit

Part Number: FLO-817778

Not Yet Reviewed

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-Back, Split Rear, Stainless Steel, Natural, Dodge, 6.2, 6.4L, Kit

Part Number: FLO-817739

4.0 out of 5 stars ( 4 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-back, Single In/Dual Out, Stainless Steel, Natural, Toyota, 3.5L, Kit

Part Number: FLO-817719

3.67 out of 5 stars ( 3 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-Back, Split Rear, Stainless Steel, Natural, Dodge, 3.6L, Kit

Part Number: FLO-817737

4.57 out of 5 stars ( 7 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Cat-Back, Split Rear Exit, Stainless Steel, Natural, Dodge, 5.7L, Kit

Part Number: FLO-817658

4.83 out of 5 stars ( 6 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Axle-Back, Stainless Steel, Jeep, JL, 3.6, Kit

Part Number: FLO-817837

Not Yet Reviewed

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, Cat-back, American Thunder, 409 Stainless Steel, Dual Exit, Jeep, JL, Kit

Part Number: FLO-817819

Not Yet Reviewed

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, American Thunder, Rear Axle-back, Dual, Stainless Steel, Black, Split Rear Exit, Chevy, 2.0L, Kit

Part Number: FLO-817751

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust System, Axle Back, American Thunder, 409 Stainless Steel, Dual Exit, Ford, Kit

Part Number: FLO-817799

Not Yet Reviewed

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

Exhaust Systems, American Thunder, Cat-back, Dual, Stainless Steel, Natural, Rear Exit, Polished Tips, Dodge, 6.2L, 6.4L, Kit

Part Number: FLO-817758

Not Yet Reviewed

Estimated Ship Date: Monday 3/2/2026 if shipped by air

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Estimated Ship Date: Monday 3/2/2026 if shipped by air

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