Description
The Flowmaster American Thunder® Cat-Back Exhaust System is designed for 2019–2026 GM Silverado and Sierra 1500 trucks (new body style) with the 5.3L engine and factory single exhaust. This system delivers a deep, aggressive exterior tone with a moderate growl inside the cab, providing both performance and sound improvements.
Constructed from durable 409 stainless steel, this bolt-on cat-back system features a single in/dual out Super 40® Series muffler and mandrel-bent dual 2.50-inch stainless steel tailpipes. The system provides maximum performance with up to 21 horsepower and 23 lb.ft. of torque gains at the rear wheels. Designed for towing and daily driving, it includes your choice of tailpipe exits: dual out the rear under the bumper or dual out the side behind the rear wheels to prevent blowing exhaust on trailers or boats.
Installation is easy with factory hanger locations, complete hardware, and detailed instructions. The system is finished with a pair of 3.50-inch double-wall polished 304 stainless steel tips embossed with the Flowmaster logo and backed by Flowmaster’s Lifetime Limited Warranty.
Key Features
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Aggressive to moderate exterior sound with mild interior growl
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Super 40® Series single in/dual out muffler
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Mandrel-bent 2.50-inch stainless steel tailpipes
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Large 3.50-inch double-wall polished stainless steel tips
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Choice of dual rear or dual side exit for towing applications
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Full 409 stainless steel construction for durability
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Uses factory hanger locations for bolt-on installation
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Easy at-home installation with included hardware and instructions
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Clears factory spare tire
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Maximum dyno gains of 21 hp and 23 lb.ft. torque
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Lifetime Limited Warranty
Fitment Information
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Fits 2019–2026 GM Silverado 1500 trucks (new body style)
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Fits 2019–2026 GM Sierra 1500 trucks (new body style)
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Engine compatibility: 5.3L V8
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Drivetrain: 2WD and 4WD
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Cab configuration: Crew cab and Double cab
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Factory single exhaust required
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Cat-back exhaust system configuration
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Tailpipe exit: Choice of dual rear or dual side
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Valve included: No
Muffler Specifications
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Muffler included: Yes
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Muffler quantity: 1
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Muffler series: Super 40 Series
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Muffler type: Reflection
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Muffler body material: 409 stainless steel
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Muffler body shape: Oval
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Muffler body length: 13.50 IN
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Muffler body width: 10.00 IN
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Muffler body height: 5.00 IN
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Muffler color: Black
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Muffler finish: Black high-temperature paint
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Muffler inlet connection: Slip-Fit
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Muffler inlet inside diameter: 3.00 IN
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Muffler inlet outside diameter: 3.13 IN
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Muffler inlet location: Center
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Muffler outlet connection: Slip-Fit
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Muffler outlet diameter: 2.50 IN
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Muffler outlet location: Dual
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Muffler outlet quantity: 2
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Muffler overall length: 19.50 IN
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Muffler flanged inlet: No
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Muffler flanged outlet: No
Exhaust Tip Specifications
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Exhaust tip quantity: 2
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Exhaust tip diameter: 3.50 IN
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Exhaust tip length: 13.00 IN
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Exhaust tip material: 304 stainless steel
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Exhaust tip finish: Polished
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Exhaust tip shape: Round
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Exhaust tip cut: Angled
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Exhaust tip edge: Angle cut
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Exhaust tip wall: Double wall
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Tip logo: Embossed
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Exhaust tip resonated: No
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Exhaust tip intercooled: No
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Exhaust tip connection: Clamp-On
Exhaust System Specifications
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Brand: Flowmaster
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Exhaust series: American Thunder
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Product type: Exhaust system
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Part type: Exhaust system
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Category: Exhaust
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Subcategory: Exhaust and tail pipes
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Sound level: Aggressive / Moderate
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Grade type: Performance
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Finish: Natural
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Pipe color: Silver
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Pipe material: 409 stainless steel
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Main piping diameter: 2.50 IN
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Inlet type: Clamp-On
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Clamping type: Flat band
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Clamps included: Yes
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Gasket or seal included: No
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Hangers included: Yes
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Mount type: Uses factory hangers
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Mounting bracket included: Yes
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Heat shield included: No
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Spring bolt kit included: No
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Valve included: No
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Valve type: Not applicable
