Description
Apollo GT Series 4" 409 Stainless Steel Cat-Back Exhaust System
Chevrolet Silverado / GMC Sierra 2500HD & 3500HD 6.6L Gas (2020–2025)
The Apollo GT Series Cat-Back Exhaust System is engineered to deliver improved exhaust flow, a powerful deep exhaust tone, and long-term durability for 6.6L gas-powered Silverado and Sierra HD trucks. Designed using advanced computer-aided engineering and manufactured in the USA, this system provides a precise factory-style fit with aggressive styling and performance-focused construction.
Constructed from 4-inch mandrel-bent 409 stainless steel tubing, the Apollo GT exhaust ensures smooth, unrestricted exhaust flow while maintaining excellent corrosion resistance under demanding conditions. A high-flow 409 stainless steel muffler enhances exhaust efficiency and produces a deep, authoritative sound without excessive drone.
Key Features & Benefits
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4" Mandrel-Bent 409 Stainless Steel Tubing:
Maximizes exhaust flow while maintaining strength, durability, and corrosion resistance. -
High-Flow 409 Stainless Steel Muffler:
Designed to reduce backpressure and deliver a deep, aggressive exhaust tone that enhances engine performance. -
5" Black Intercooled Exhaust Tip:
Features a clamp-on, 409 stainless steel construction with a black finish and riveted aFe POWER logo plate for a bold, performance-inspired appearance. -
Deep Exhaust Sound:
Produces a rich, deep tone that unleashes available horsepower and torque without harsh resonance. -
Factory-Style Flange and Hangers:
Ensures a precise OEM-style fitment while maintaining proper exhaust alignment. -
Direct Bolt-On Installation:
Requires no cutting or modifications. All necessary clamps and hardware are included for a hassle-free install. -
Computer-Aided Design:
CAD-engineered for high-tolerance factory fitment and consistent performance. -
100% MIG-Welded Construction:
Provides race-proven strength, structural integrity, and long-term reliability. -
Made in the USA:
Designed and manufactured at aFe POWER’s Corona, California facility.
Fitment Notes
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Extended Cab / Short Bed: 149.4" Wheelbase
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Crew Cab / Short Bed: 159" Wheelbase
Emissions Disclaimer
This product does not require a CARB EO number and does not affect factory emissions equipment.
Vehicle Applications
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2020–2025 Chevrolet Silverado 2500 HD – 6.6L Gas
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2020–2025 Chevrolet Silverado 3500 HD – 6.6L Gas
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2020–2025 GMC Sierra 2500 HD – 6.6L Gas
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2020–2025 GMC Sierra 3500 HD – 6.6L Gas
The Apollo GT Series Cat-Back Exhaust System is the ideal upgrade for HD truck owners seeking improved exhaust flow, aggressive sound, durable stainless steel construction, and a clean, factory-style installation.
