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Flowmaster 818204 American Thunder Cat-Back Exhaust System

(2025 Ram 1500 Limited/Limited Longhorn/Tungsten)

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

818204
5 reviews
Sale Price

$594.95

In Stock (10+)

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Usually delivered within 2 days

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Fitment guaranteed

Fitment guaranteed

Product Details

The Flowmaster 818204 American Thunder Cat-Back Exhaust System delivers aggressive sound and proven performance gains for truck enthusiasts seeking a quality upgrade over their stock exhaust. This direct-fit system is engineered to maximize exhaust flow while providing the distinctive Flowmaster tone.

Performance Features:

  • Super 40 series chambered muffler design produces a deep, aggressive to moderate exhaust note
  • Delivers maximum increases of up to 18 horsepower and 15 lb-ft of torque over stock exhaust at the wheels
  • 3.0-inch mandrel-bent tubing maintains consistent diameter for optimal exhaust flow
  • Constructed from 16-gauge 409 stainless steel for long-lasting durability and corrosion resistance

Installation and Quality:

  • Direct-fit design utilizes factory-styled hangers in stock locations for straightforward installation
  • Complete hardware kit included for hassle-free installation
  • Backed by Flowmaster's Lifetime Limited Warranty

This American Thunder system combines performance engineering with practical installation, making it an ideal choice for drivers who want improved power, enhanced exhaust tone, and reliable quality from a trusted exhaust brand.

Products specifications

Fits

2025 Ram 1500 Limited/Limited Longhorn/Tungsten

Body Height

5.00

Body Length

10.75

Body Material

409 Stainless Steel

Brand

Flowmaster

Prop 65

Yes

California Proposition 65 Chemical Name

Nickel (Metallic)

California Proposition 65 Chemical Name

Chromium (hexavalent compounds)

Catalytic Converter Quantity

0

Clamping Type

Flat Band

Clamps Included

Yes

Color

Black

Emission Code

5

Exhaust Series

American Thunder

Exhaust Tip Quantity

Sold Separately

Exhaust Tip Quantity

0

Exit Position

DOR

Exit Style

Dual Out Rear

Finish

High-Temperature Paint

Gasket Or Seal Included

No

Grade Type

Performance

Hangers Included

Yes

Heat Shield Attached

No

Inlet Inside Diameter

2.75

Inlet Location

Dual

Inlet Position

Dual

Inlet Quantity

2

Inlet Type

Flanged

Material

409 Stainless Steel

Mount Type

Uses Factory Hangers

Mounting Bracket Included

No

Muffler Body Length (in)

13.5

Muffler Body Material

409 Stainless Steel

Muffler Body Shape

Oval

Muffler Color

Black

Muffler Finish

Painted

Muffler Inlet Diameter

3

Muffler Inlet Location

Dual

Muffler Material

409 Stainless Steel

Muffler Outlet Diameter

3

Muffler Outlet Location

Dual Outlet

muffler part number

Kit Only

Muffler Quantity

1

Muffler Series

Super 40

Muffler Shape

Oval

Muffler Type

Reflection

Outlet Inside Diameter

2.75

Outlet Location

Dual

Outlet Position

Dual

Outlet Quantity

2

Outlet Type

Slip-Fit

Overall Length

59

Part Type

Exhaust Muffler Assembly

Pipe Material

409 Stainless Steel

Product Type

Exhaust System

Single Dual

Dual

Sound Level

Aggressive

Spring Bolt Kit Included

No

System Type

Direct-Fit Muffler

Tip Style

Not Included

Tubing Diameter (in)

3

Tubing Material

Uses factory hangers

Vehicle Type

Truck/SUV

Warning

California Proposition 65

Website was confusing on my phone. Had to retry several times to get shipping to change.

No problems

Entering CVV was difficult

Excellent overall.

Easy to order and shipping was fast

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