Flowmaster flo818113 American Thunder Cat-Back Exhaust System

This Flowmaster® American Thunder® cat-back exhaust system for the 2019-2026 Chevrolet/GMC Silverado/Sierra with the 2.7-liter engine is manufactured using durable 409 stainless steel throughout and features dual 2.50-inch mandrel bent pipes for better exhaust gas flow, and an American Thunder muffler is used for a moderate sound level and maximum performance. Gain up to 4 hp and 11 lbs-ft of torque at the rear wheels over stock. This system exits dual out the rear or dual out the side, with dual 3.50-inch polished tips for added style and a custom look. The system uses all the existing factory hanger locations and includes installation instructions and all necessary hardware for an easy installation that you can do at home. Backed by Flowmaster's Lifetime Limited Warranty. Fits 2019-2026 Chevrolet/GMC Silverado/Sierra 2.7-Liter, Cat-Back, Dual Out Rear/Side Exit, Stainless Steel Exhaust System Fits 2019-2026 Chevrolet/GMC Silverado/Sierra trucks with 2.7-liter engines, 2 & 4-wheel drive. Does not fit models with the Multimatic suspension option.

• Dual 2.50-inch mandrel bent 16-gauge 409 stainless steel tubing maximizes exhaust flow and improves durability
• 50 Series Big Block performance muffler delivers a deep, moderate performance tone and improves exhaust flow
• Includes complete hardware and factory styled hangers in the stock locations for an easy installation
• Dual 3.50-inch polished tips exit dual out the rear or side for a custom look
• Gain up to 4 hp and 11 lbs-ft of torque at the rear wheels
• Flowmaster’s Lifetime Limited Warranty
• Fits 147-inch and 157-inch wheelbases

The Flowmaster American Thunder cat-back exhaust system is designed for 2019–2026 Chevrolet Silverado and GMC Sierra trucks equipped with 2.7-liter engines. This stainless steel system features dual rear or side exits and is designed for 2- and 4-wheel-drive models. It does not fit models equipped with the Multimatic suspension option.

Dual 2.50-inch mandrel-bent 16-gauge 409 stainless steel tubing supports exhaust flow and durability. The 50 Series Big Block performance muffler produces a deep, moderate performance tone. Testing indicates gains of up to 4 horsepower and 11 lb-ft of torque at the rear wheels over stock. Dual 3.50-inch polished tips provide a custom appearance.

The system uses factory hanger locations and includes complete installation hardware and instructions for an at-home installation. It fits 147-inch and 157-inch wheelbases and is backed by Flowmaster's Lifetime Limited Warranty.

What's Included: Cat-back exhaust system, performance muffler, polished exhaust tips, installation hardware, factory-styled hangers and installation instructions.

Fitment: 2019–2026 Chevrolet Silverado and GMC Sierra with 2.7-liter engines, including 2- and 4-wheel-drive models. Does not fit vehicles with the Multimatic suspension option.

Features:

• Exhaust tubing: Dual 2.50-inch mandrel-bent 16-gauge 409 stainless steel tubing supports exhaust flow and durability.
• Performance muffler: 50 Series Big Block muffler delivers a deep, moderate performance tone.
• Performance gains: Provides gains of up to 4 horsepower and 11 lb-ft of torque at the rear wheels over stock.
• Exit design: Dual 3.50-inch polished tips support dual rear or side exhaust exits and provide a custom appearance.
• Installation: Uses existing factory hanger locations and includes complete hardware and installation instructions.
• Application: Fits 2019–2026 Chevrolet Silverado and GMC Sierra trucks with 2.7-liter engines and 147-inch or 157-inch wheelbases.
• Drivetrain fitment: Designed for 2- and 4-wheel-drive models; does not fit models with the Multimatic suspension option.
• Warranty: Backed by Flowmaster's Lifetime Limited Warranty.

Fitments:
2019 Chevrolet Silverado 1500 LT
2019 Chevrolet Silverado 1500 RST
2019 Chevrolet Silverado 1500 WT
2019 GMC Sierra 1500 Base
2019 GMC Sierra 1500 Elevation
2019 GMC Sierra 1500 SLE
2020 Chevrolet Silverado 1500 Custom
2020 Chevrolet Silverado 1500 LT
2020 Chevrolet Silverado 1500 RST
2020 Chevrolet Silverado 1500 WT
2020 GMC Sierra 1500 Base
2020 GMC Sierra 1500 Elevation
2020 GMC Sierra 1500 SLE
2021 Chevrolet Silverado 1500 Custom
2021 Chevrolet Silverado 1500 LT
2021 Chevrolet Silverado 1500 RST
2021 Chevrolet Silverado 1500 WT
2021 GMC Sierra 1500 Base
2021 GMC Sierra 1500 Elevation
2021 GMC Sierra 1500 SLE
2022 Chevrolet Silverado 1500 Custom
2022 Chevrolet Silverado 1500 Custom Trail Boss
2022 Chevrolet Silverado 1500 LT
2022 Chevrolet Silverado 1500 LT Trail Boss
2022 Chevrolet Silverado 1500 RST
2022 Chevrolet Silverado 1500 WT
2022 Chevrolet Silverado 1500 LTD Custom
2022 Chevrolet Silverado 1500 LTD Custom Trail Boss
2022 Chevrolet Silverado 1500 LTD LT
2022 Chevrolet Silverado 1500 LTD RST
2022 Chevrolet Silverado 1500 LTD WT
2022 GMC Sierra 1500 Elevation
2022 GMC Sierra 1500 Pro
2022 GMC Sierra 1500 SLE
2022 GMC Sierra 1500 Limited Elevation
2022 GMC Sierra 1500 Limited Pro
2022 GMC Sierra 1500 Limited SLE
2023 Chevrolet Silverado 1500 Custom
2023 Chevrolet Silverado 1500 Custom Trail Boss
2023 Chevrolet Silverado 1500 LT
2023 Chevrolet Silverado 1500 LT Trail Boss
2023 Chevrolet Silverado 1500 RST
2023 Chevrolet Silverado 1500 WT
2023 GMC Sierra 1500 Elevation
2023 GMC Sierra 1500 Pro
2023 GMC Sierra 1500 SLE
2024 Chevrolet Silverado 1500 Custom
2024 Chevrolet Silverado 1500 Custom Trail Boss
2024 Chevrolet Silverado 1500 LT
2024 Chevrolet Silverado 1500 LT Trail Boss
2024 Chevrolet Silverado 1500 RST
2024 Chevrolet Silverado 1500 WT
2024 GMC Sierra 1500 Elevation
2024 GMC Sierra 1500 Pro
2024 GMC Sierra 1500 SLE
2025 Chevrolet Silverado 1500 Custom
2025 Chevrolet Silverado 1500 Custom Trail Boss
2025 Chevrolet Silverado 1500 LT
2025 Chevrolet Silverado 1500 LT Trail Boss
2025 Chevrolet Silverado 1500 RST
2025 Chevrolet Silverado 1500 WT
2025 GMC Sierra 1500 Elevation
2025 GMC Sierra 1500 Pro
2025 GMC Sierra 1500 SLE
2026 Chevrolet Silverado 1500 Custom
2026 Chevrolet Silverado 1500 Custom Trail Boss
2026 Chevrolet Silverado 1500 LT
2026 Chevrolet Silverado 1500 LT Trail Boss
2026 Chevrolet Silverado 1500 RST
2026 Chevrolet Silverado 1500 WT
2026 GMC Sierra 1500 Elevation
2026 GMC Sierra 1500 Pro
2026 GMC Sierra 1500 SLE

Air Freight Prohibited: false
Not Carb Approved: false
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Units Per Sku: 1