The Flowmaster® American Thunder® Cat-Back Exhaust System delivers an aggressive exterior tone with a moderate interior sound for 2019–2026 GM 1500 (new body style) trucks equipped with the 5.3L engine. It is designed for drivers seeking an upgraded exhaust note along with noticeable performance improvements, delivering maximum dyno-proven gains of 15 horsepower and 19 lb-ft of torque at the rear wheels.

This system is constructed from durable stainless steel and features a flex joint, 3.00-inch mandrel-bent stainless steel tubing that flows into a Super 40® Series muffler. It continues with dual 2.50-inch mandrel-bent stainless steel tailpipes and finishes with quad 4.00-inch black ceramic-coated stainless steel tips that exit beneath the factory exhaust bezels. The system installs easily using factory hanger locations, and all required hardware is included for a straightforward at-home installation.

Fitment

• Fits 2019–2026 Chevrolet Silverado 1500 with 5.3L engine
• Fits 2019–2026 GMC Sierra 1500 with 5.3L engine
• Fits Crew Cab models
• Fits Double Cab models
• Fits 5.5-ft bed
• Fits 6.5-ft bed
• Requires factory dual exhaust option

Features

• Large 4.00-inch black ceramic-coated stainless quad tips
• Maximum gains of 15 hp and 19 lb-ft of torque
• Moderate interior tone with an aggressive exterior sound
• Uses factory hanger locations
• Large-volume Super 40 muffler
• Stainless steel construction
• Lifetime limited warranty
• Easy installation

Specifications

• Brand: Flowmaster
• California Proposition 65: Yes
• CARB Compliant: Yes
• Catalytic Converter Included: No
• Catalytic Converter Quantity: 0
• Category: Exhaust
• Clamping Type: Flat Band
• Clamps Included: Yes
• Emission Code: 5
• Exhaust Series: American Thunder
• Exhaust Tip Color: Black
• Exhaust Tip Connection: Welded
• Exhaust Tip Cut: Angled
• Exhaust Tip Diameter: 4.00 in
• Exhaust Tip Edge: Angle Cut
• Exhaust Tip Finish: Black Ceramic Coating
• Exhaust Tip Intercooled: No
• Exhaust Tip Length: 7.50 in
• Exhaust Tip Material: 304 Stainless Steel
• Exhaust Tip Quantity: 4
• Exhaust Tip Resonated: No
• Exhaust Tip Shape: Round
• Exhaust Tip Wall: Single Wall
• Exit Style: Dual Out Rear
• Finish: Natural
• Gasket or Seal Included: No
• Grade Type: Performance
• Hangers Included: Yes
• Inlet Type: Clamp-On
• Main Piping Diameter: 2.50 in
• Mount Type: Uses factory hangers
• Mounting Bracket Included: No
• Muffler Body Height: 5.00 in
• Muffler Body Length: 13.50 in
• Muffler Body Material: 409 Stainless Steel
• Muffler Body Shape: Oval
• Muffler Body Width: 10.00 in
• Muffler Finish: Black High-Temperature Paint
• Muffler Flanged Inlet: No
• Muffler Flanged Outlet: No
• Muffler Included: Yes
• Muffler Inlet Connection: Slip-Fit
• Muffler Inlet Inside Diameter: 3.00 in
• Muffler Inlet Outside Diameter: 3.13 in
• Muffler Outlet Connection: Slip-Fit
• Muffler Outlet Quantity: 2
• Muffler Quantity: 1
• Muffler Series: Super 40 Series
• Muffler Type: Chambered
• Part Type: Exhaust System
• Pipe Color: Silver
• Pipe Material: 409 Stainless Steel
• Product Type: Exhaust System
• Sound Level: Aggressive / Moderate
• Spring Bolt Kit Included: No
• Sub Category: Exhaust and Tail Pipes
• Tail Pipe Outlet Outside Diameter: 2.50 in
• Tail Pipe Quantity: 2
• Tail Pipe Tapered Outlet: No
• Type: Cat-Back
• Valve Included: No
• Valve Type: Not Applicable

This high-quality system is engineered to deliver improved performance, an enhanced exhaust tone, and a simple, hassle-free installation experience.