Flowmaster American Thunder Active Valve Cat-Back for 2024+ Silverado/Sierra 1500 - 818206

The Flowmaster American Thunder Cat-Back Exhaust System, part number 818206, is designed for select 2024-2026 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks equipped with the 6.2L engine. Constructed from durable 409 stainless steel, this active-valve exhaust system features a 3.5-inch inlet feeding a specially tuned 50 Series HD chambered muffler and dual 2.5-inch mandrel-bent tailpipes. Its OEM-style active valve integrates with the factory drive-mode controls, allowing the exhaust sound to change with Normal, Sport, and Off-Road modes while retaining the factory valve actuator.

Key Features & Specs:

• Series: Flowmaster American Thunder
• Type: Active-valve cat-back exhaust system
• Engine Compatibility: 6.2L
• Drivetrain: 2WD and 4WD
• Material: 409 stainless steel
• Inlet Diameter: 3.5-inch
• Tailpipe Diameter: Dual 2.5-inch
• Tubing Construction: 16-gauge mandrel-bent stainless steel
• Muffler: Tuned Flowmaster 50 Series HD
• Muffler Design: Chambered with integrated resonance chamber
• Sound Level: Aggressive to moderate
• Active Valve: OEM-style valve with integrated turndown
• Valve Control: Retains factory dash/drive-mode sound control
• Valve Actuator: Factory OEM actuator is reused
• Exit Style: Dual rear through factory bumper cutout locations
• Exhaust Tips: 4-inch black ceramic-coated 304 stainless steel
• Tip Style: Rolled-edge angle-cut, double-wall
• Performance: Maximum tested gains up to 15 hp and 13 lb-ft at the rear wheels
• Installation: Uses factory hanger locations and connections
• Included: Clamps, hangers, hardware, and installation instructions
• Part Number: 818206
• Warranty: Flowmaster Lifetime Limited Warranty

Fitment:

Fits applicable 2024-2026 Chevrolet Silverado 1500 and GMC Sierra 1500 models equipped with the 6.2L engine.

• 2024-2026 Chevrolet Silverado 1500 High Country
• 2024-2026 Chevrolet Silverado 1500 LT Trail Boss
• 2024-2026 Chevrolet Silverado 1500 LTZ
• 2024-2026 Chevrolet Silverado 1500 RST
• 2024-2026 GMC Sierra 1500 AT4
• 2024-2026 GMC Sierra 1500 Denali
• 2024-2026 GMC Sierra 1500 Denali Ultimate
• 2024-2026 GMC Sierra 1500 SLT

Installation Note: The active-valve system reuses the factory OEM valve actuator; a new actuator is not included.