The Flowmaster American Thunder Axle-Back Exhaust System is designed for 2016–2024 Camaro SS and ZL1 models equipped with the 6.2L engine and Factory NPP Exhaust option. This system delivers a deep, aggressive sound in Track mode while maintaining a smooth, stealthy tone for everyday driving.

The kit combines tandem 40 Delta Flow™ Series mufflers for daily driving with race-proven Outlaw® mufflers to increase exhaust volume when Track mode is engaged. Large quad 4.00-inch polished stainless steel tips replicate the factory quad NPP look, and functional exhaust valves work with the OEM actuators to seamlessly switch between sound levels.

Crafted from full stainless steel, the system uses factory hanger locations for easy installation and is compatible with both coupe and convertible models. All necessary parts and hardware are included. Backed by Flowmaster’s Lifetime Limited Warranty, this axle-back system ensures maximum performance and reliability.

Key Features

• Dyno-tuned for maximum performance
• Deep, powerful stealth sound for daily driving
• Aggressive track sound in Track mode
• Uses factory hanger locations for easy installation
• Includes high-quality OEM-style exhaust valves
• Full stainless steel construction
• Quad 4.00-inch polished stainless steel tips
• Compatible with Scavenger Series mid-pipe (#81083 for 6-speed manual with factory MDS valves)
• Lifetime Limited Warranty

Specifications

• Brand: Flowmaster
• California Proposition 65: Yes
• Chemical Name: Chromium (hexavalent compounds)
• CARB Compliant: Yes
• Catalytic Converter Included: No
• Category: Exhaust
• Clamping Type: Flat Band
• Clamps Included: Yes
• Emission Code: 5
• Exhaust Series: American Thunder
• Exhaust Tip Color: Silver
• Exhaust Tip Connection: Welded
• Exhaust Tip Cut: Angled
• Exhaust Tip Diameter: 4.00 in
• Exhaust Tip Edge: Angle Cut
• Exhaust Tip Finish: Polished
• Exhaust Tip Material: 304 Stainless Steel
• Exhaust Tip Quantity: 4
• Exhaust Tip Shape: Round
• Exhaust Tip Wall: Double Wall
• Exit Style: Dual Out Rear
• Finish: Natural
• Gasket or Seal Included: No
• Grade Type: Performance
• Hangers Included: Yes
• Heat Shield Included: No
• Inlet Type: Clamp-On
• Main Piping Diameter: 3.00 in
• Mount Type: Uses Factory Hangers
• Muffler Body Material: 409 Stainless Steel
• Muffler Body Shape: Oval
• Muffler Body Finish: Black High-Temperature Paint
• Muffler Series: 40 Series Delta Flow, Outlaw
• Muffler Type: Chambered
• Muffler Quantity: 2
• Sound Level: Aggressive
• Tail Pipe Quantity: 2
• Tip Logo: Embossed
• Type: Axle-Back
• Valve Included: Yes (OEM-style valves)

Fitment 

Compatible Vehicles:
• 2016–2024 Chevrolet Camaro SS 6.2L (Factory NPP Exhaust)
• 2016–2024 Chevrolet Camaro ZL1 6.2L (Factory NPP Exhaust)

Notes / Requirements:
• Requires Factory NPP Exhaust option (identified by quad tips)
• Compatible with both coupe and convertible models
• Functional OEM-style valves included for variable sound control
• Works with Flowmaster Scavenger Series mid-pipe for 6-speed manual with MDS valves