Flowmaster 818167 American Thunder Cat-Back Exhaust System Chevrolet Colorado/GMC Canyon AT4/AT4X/Trail Boss/ZR2 23-26

Flowmaster American Thunder Cat-Back Exhaust System

The Flowmaster American Thunder cat-back exhaust system is designed for the 2023–2026 GM Colorado and Canyon equipped with the 2.7-liter turbo engine. It is manufactured from durable 16-gauge 409 stainless steel tubing and features a 3.00-inch inlet transitioning to dual 2.50-inch mandrel-bent pipes for improved exhaust gas flow and durability.

A 50 Series Big Block performance muffler delivers a deep, aggressive-to-moderate exhaust tone while supporting maximum performance. Dyno testing showed gains of up to 13 horsepower and 15 lb-ft of torque at the rear wheels compared with the stock exhaust.

The system includes dual 3.50-inch polished stainless steel tips for a custom appearance, along with both dual-out rear-exit and side-exit pipes so you can select the preferred configuration. It uses the existing factory hanger locations and includes installation instructions and all required hardware.

• Material: 16-gauge 409 stainless steel
• Pipe Configuration: 3.00-inch inlet to dual 2.50-inch mandrel-bent pipes
• Muffler: 50 Series Big Block performance muffler
• Exhaust Tone: Deep, aggressive-to-moderate performance sound
• Exhaust Tips: Dual 3.50-inch polished stainless steel tips
• Performance Gain: Up to 13 horsepower and 15 lb-ft of torque at the wheels
• Exit Options: Dual-out rear exit and side exit pipes included
• Installation: Uses factory hanger locations and includes all necessary hardware and instructions
• Warranty: Lifetime Limited Warranty

*Verify the desired rear-exit or same-side-exit configuration before installation. The system is designed to use the existing factory hanger locations.

Compatibility / Fitment

• Vehicle Make: GM
• Vehicle Models: Colorado, Canyon
• Model Years: 2023–2026
• Engine: 2.7-liter turbo
• Exhaust Type: Cat-back
• Exhaust Configuration: Dual-out, same-side exit; rear-exit and side-exit pipes are included
• Material: Stainless steel

Flowmaster 818167 American Thunder Cat-Back Exhaust System Chevrolet Colorado/GMC Canyon AT4/AT4X/Trail Boss/ZR2 23-26 - Features