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Flowmaster 818206 American Thunder Cat-Back Exhaust System

(2024-2026 Chevrolet Silverado 1500; 2024-2026 GMC Sierra 1500)

Part of: Flowmaster American Thunder Cat-Back Exhaust System

Other options in this family: Flowmaster 17395 Flowmaster 817568 Flowmaster 17213 Flowmaster 818196 Flowmaster 818176

Manufacturer

Picture for manufacturer Flowmaster

Part Number

818206
7 reviews
Sale Price

$1,599.95

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The Flowmaster 818206 American Thunder Cat-Back Exhaust System delivers enhanced performance and an aggressive exhaust note for enthusiasts seeking improved horsepower and torque. This complete bolt-on system is engineered to maximize exhaust flow while eliminating unwanted interior drone for a refined driving experience.

Performance Gains:

  • Maximum increases up to 15 horsepower and 13 lb-ft of torque over stock exhaust at the wheels
  • Mandrel-bent 16-gauge 409 stainless steel tubing in 3.5-inch and 2.5-inch diameters ensures smooth, unrestricted flow
  • 50 Series HD chambered muffler design optimizes exhaust velocity and scavenging

Sound Quality:

  • Tuned performance muffler with integrated resonance chamber eliminates interior drone
  • Deep, aggressive to moderate performance tone enhances the driving experience without excessive cabin noise
  • 50 Series HD chambered technology provides the classic Flowmaster sound

Installation and Durability:

  • Complete hardware kit and factory-styled hangers in stock locations for straightforward installation
  • 409 stainless steel construction provides superior corrosion resistance and longevity
  • Backed by Flowmaster's Lifetime Limited Warranty for peace of mind

This American Thunder system combines performance engineering with practical design, making it an ideal upgrade for drivers who want measurable power gains and an enhanced exhaust note without compromising daily drivability.

Products specifications

Fits

2024-2026 Chevrolet Silverado 1500; 2024-2026 GMC Sierra 1500

Attachment Method

Clamp-on

Brand

Flowmaster

C.A.R.B EO #

No

Prop 65

Yes

California Proposition 65 Chemical Name

Chromium (hexavalent compounds)

California Proposition 65 Chemical Name

Nickel (Metallic)

Catalytic Converter Included

No

Catalytic Converter Quantity

0

Category

Exhaust

Choose Your Part

Exhaust System

Clamping Type

Flat Band

Clamps Included

Yes

Drive

2WD

Drive

4WD

Emission Code

5

Exhaust Series

American Thunder

Exhaust Tip Color

Black

Exhaust Tip Connection

Clamp-On

Exhaust Tip Cut

Angled

Exhaust Tip Edge

Rolled Edge Angle Cut

Exhaust Tip Finish

Black Ceramic Coating

Exhaust Tip Intercooled

No

Exhaust Tip Material

304 Stainless Steel

Exhaust Tip Quantity

2

Exhaust Tip Resonated

No

Exhaust Tip Shape

Round

Exhaust Tip Wall

Double Wall

Exit Style

Dual Out Rear

Finish

Natural

Gasket Or Seal Included

No

Grade Type

Performance

Hangers Included

Yes

Heat Shield Included

No

Inlet Type

Clamp-On

Mount Type

Uses Factory Hangers

Mounting Bracket Included

Yes

Muffler Body Material

409 Stainless Steel

Muffler Body Shape

Oval

Muffler Color

Black

Muffler Finish

Black High-Temperature Paint Finish

Muffler Flanged Inlet

No

Muffler Flanged Outlet

No

Muffler Inlet Connection

Slip-Fit

Muffler Inlet Location

Offset

Muffler Outlet Connection

Slip-Fit

Muffler Outlet Location

Dual

Muffler Outlet Quantity

2

muffler part number

Kit Only

Muffler Quantity

1

Muffler Series

50 Series HD

Muffler Type

Chambered

Outlet Position

Dual

Pipe Color

Silver

Pipe Material

409 Stainless Steel

Product Type

Exhaust System

Sound Level

Aggressive / Moderate

Spring Bolt Kit Included

No

Tail Pipe Quantity

2

Tail Pipe Quantity

Dual

Tail Pipe Tapered Outlet

No

Type

Cat-Back

Valve Actuator Included

No, Reuse OEM

Valve Included

Yes

Valve Type

OEM-Style Valves

Warning

California Proposition 65

Easy checkout, product arrived quickly. Would use them again.

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