The Flowmaster American Thunder Cat-Back Exhaust System is engineered specifically for 2014–2019* (*Classic body) GM Silverado and Sierra 1500 models equipped with 4.3L or 5.3L engines. Designed to deliver a noticeable performance boost along with a powerful exhaust note, this system provides an aggressive exterior tone paired with a moderate interior sound level—perfect for drivers who want a bold presence without excessive cabin noise.

Constructed using stainless steel mandrel-bent piping, this emissions-legal bolt-on system flows into a high-performance Super 40 Series muffler utilizing Delta Flow Technology for improved power, tone, and efficiency. The exhaust exits through dual 2.50-inch stainless steel tailpipes and finishes with large 3.50-inch polished stainless steel tips.

This system is available with dual out-the-rear or dual out-the-side exit configurations and installs easily using factory hanger locations. Every kit includes all required hardware and is backed by Flowmaster’s Lifetime Limited Warranty.

Features

• Aggressive exterior sound with moderate interior tone

• Super 40 Series performance muffler

• Delta Flow Technology for enhanced performance

• Stainless steel mandrel-bent tubing

• Dual 3.50-inch polished stainless steel tips

• Bolt-on installation using factory hangers

• Lifetime Limited Warranty

• Fits Crew Cab and Double Cab models

Specifications

• Exhaust Series: American Thunder

• Product Type: Cat-Back Exhaust System

• Sound Level: Aggressive / Moderate

• Muffler Type: Chambered (Super 40 Series)

• Muffler Quantity: 1

• Muffler Material: 409 Stainless Steel

• Muffler Finish: Black High-Temperature Paint

• Muffler Inlet Diameter: 3.00 in

• Muffler Outlet Quantity: 2

• Main Piping Diameter: 2.50 in

• Inlet Type: Clamp-On

• Tailpipe Quantity: 2

• Tailpipe Outside Diameter: 2.50 in

• Exhaust Tip Quantity: 2

• Exhaust Tip Material: 304 Stainless Steel

• Exhaust Tip Diameter: 3.50 in

• Exhaust Tip Finish: Polished

• Tip Style: Double Wall, Angle Cut

• Tip Length: 13.00 in

• Exit Styles: Dual Out Rear / Dual Out Side

• Pipe Material: 409 Stainless Steel

• Clamps Included: Yes

• Hangers Included: Yes

• Mounting Bracket Included: Yes

• CARB Compliant: Yes

Fitment 

Fits 2014–2018 Silverado 1500 (New Body)
Fits 2019 Silverado 1500 Classic Body
Fits 2014–2018 Sierra 1500 (New Body)
Fits 2019 Sierra 1500 Classic Body
Fits models equipped with 4.3L engine
Fits models equipped with 5.3L engine
Fits Crew Cab models
Fits Double Cab models
Fits 2WD and 4WD configurations