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Flowmaster 818113 American Thunder Cat-Back Exhaust System

(2019-2026 Chevrolet Silverado 1500; 2022 Chevrolet Silverado 1500 LTD; 2019-2026 GMC Sierra 1500; 2022 GMC Sierra 1500 Limited Elevation/Pro/SLE)

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

818113
6 reviews
Sale Price

$739.95

In Stock (10+)

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Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Flowmaster 818113 American Thunder Cat-Back Exhaust System delivers exceptional performance and sound for your vehicle. This complete exhaust system is engineered to increase horsepower and torque while providing the aggressive tone Flowmaster is known for.

Performance Features:

  • Gain up to 4 horsepower and 11 lb-ft of torque at the rear wheels
  • 50 Series Big Block performance muffler delivers a deep, moderate performance tone
  • Dual 2.50-inch mandrel bent tubing maximizes exhaust flow and reduces backpressure
  • Constructed from 16-gauge 409 stainless steel for superior durability and corrosion resistance

Styling and Installation:

  • Dual 3.50-inch polished stainless steel tips for a premium appearance
  • Tips can exit dual out the rear or side for custom configuration
  • Designed to fit 147-inch and 157-inch wheelbases
  • Complete hardware and factory-styled hangers included for easy bolt-on installation in stock locations
  • Backed by Flowmaster's Lifetime Limited Warranty

This American Thunder system combines performance gains with a sophisticated exhaust note that's aggressive without being overly loud, making it ideal for enthusiasts seeking improved power and sound quality.

Products specifications

Fits

2019-2026 Chevrolet Silverado 1500; 2022 Chevrolet Silverado 1500 LTD; 2019-2026 GMC Sierra 1500; 2022 GMC Sierra 1500 Limited Elevation/Pro/SLE

Brand

Flowmaster

Prop 65

Yes

California Proposition 65 Chemical Name

Nickel (Metallic)

California Proposition 65 Chemical Name

Chromium (hexavalent compounds)

Catalytic Converter Quantity

0

Category

Exhaust

Clamping Type

Flat Band

Clamps Included

Yes

Emission Code

5

Exhaust Series

American Thunder

Exhaust Tip Color

Silver

Exhaust Tip Connection

Clamp-On

Exhaust Tip Cut

Angled

Exhaust Tip Edge

Angle Cut

Exhaust Tip Finish

Polished

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 Side

Exit Style

Dual Out Rear

Finish

Natural

Gasket Or Seal Included

No

Grade Type

Performance

Hangers Included

Yes

Inlet Type

Flanged

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

Center

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 Big Block

Muffler Type

Reflection

Pipe Color

Silver

Pipe Material

409 Stainless Steel

Product Type

Exhaust System

Sound Level

Moderate

Spring Bolt Kit Included

No

Sub Category

Exhaust and Tail Pipes

Tail Pipe Quantity

2

Tail Pipe Quantity

Dual

Tail Pipe Tapered Outlet

No

Tip Logo

Embossed

Tip Style

Double wall

Type

Cat-Back

Valve Included

No

Valve Type

Not Applicable

Warning

California Proposition 65

it was easy and great

They had a hard to find pump for a decent price. It arrived when they said it would. Haven't installed it yet so we'll see how it works

Quick selection and nice site layout

Easy website and great price for a great product.

very good

Good

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