Description
Apollo GT Series 4 IN 409 Stainless Steel Cat-Back Exhaust System
For 2020–2025 GM Silverado & Sierra 2500HD / 3500HD 6.6L Gas
Enhance the performance, sound, and appearance of your HD gas truck with the aFe POWER Apollo GT Series 4" Cat-Back Exhaust System. Engineered for strength, precision fitment, and aggressive tone, this system is the perfect upgrade for 6.6L gas-powered Silverado and Sierra HD models.
Durable 4" 409 Stainless Steel Construction
This exhaust system is constructed from 4-inch mandrel-bent 409 stainless steel tubing, offering excellent durability and corrosion resistance for demanding driving conditions. Mandrel-bent tubing ensures unrestricted exhaust flow by minimizing turbulence, helping to unlock improved horsepower, torque, and throttle response.
High-Flow Performance Muffler
Equipped with a high-flow 409 stainless steel muffler, the Apollo GT system delivers a deep, powerful exhaust note while maintaining smooth exhaust flow across the power band. The tuned design enhances performance without sacrificing drivability.
5" Polished Intercooled Exhaust Tip
Finishing the system is a 5-inch polished 409 stainless steel intercooled clamp-on exhaust tip, featuring a riveted aFe POWER logo plate for a clean, aggressive appearance that complements the HD truck platform.
Precision Fit & Hassle-Free Installation
Designed using advanced computer-aided design (CAD) technology, this system delivers factory-like fitment with tight tolerances. A factory-style flange and OE-style hangers allow for a true bolt-on installation using existing mounting locations—no cutting or modifications required. All necessary hardware is included.
Race-Proven Strength
Every Apollo GT exhaust system is 100% MIG-welded to ensure maximum structural integrity, durability, and long-term reliability under high heat and vibration.
Additional Information
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Fitment:
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Extended Cab / Short Bed – 149.4" Wheelbase
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Crew Cab / Short Bed – 159" Wheelbase
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Emissions Disclaimer: This product does not require a CARB EO#
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Manufacturing: Engineered and manufactured by aFe POWER in Corona, California
The Apollo GT Series 4" Cat-Back Exhaust System delivers the ideal blend of deep exhaust tone, improved performance, and OE-quality fitment for GM HD gas trucks.
