Description
Apollo GT Series 4-Inch 409 Stainless Steel Cat-Back Exhaust System
The Apollo GT Series 4-Inch Cat-Back Exhaust System from aFe POWER is engineered to deliver increased exhaust flow, enhanced durability, and a deep, aggressive exhaust tone for heavy-duty gas-powered HD trucks. Constructed from mandrel-bent 4-inch 409 stainless steel tubing, this system improves exhaust efficiency while maintaining exceptional strength and long-term corrosion resistance.
Designed as a direct bolt-on upgrade, the Apollo GT Series utilizes factory-style flanges and hangers to ensure precise fitment, vibration control, and hassle-free installation—no cutting or modifications required.
Key Features & Benefits
Heavy-Duty 4-Inch Stainless Steel Construction
Built from 4-inch mandrel-bent 409 stainless steel tubing, this cat-back exhaust system maximizes exhaust flow while providing excellent durability for demanding driving and towing applications.
High-Flow Stainless Steel Muffler
A high-flow 409 stainless steel muffler delivers a deep, powerful exhaust note, unleashing available horsepower and torque without excessive restriction.
5-Inch Polished Intercooled Exhaust Tip
The system is finished with a 5-inch diameter polished 409 stainless steel intercooled clamp-on exhaust tip, featuring a riveted aFe POWER logo plate for a bold, performance-driven appearance.
Deep Performance Sound
Designed to produce a deep exhaust tone, this system enhances engine presence while maintaining refined drivability for street and work use.
OE-Style Fitment and Secure Mounting
Factory-style flanges and hangers ensure proper alignment and stability under heat and vibration, delivering OEM-quality fitment and long-term reliability.
Hassle-Free Bolt-On Installation
This exhaust system installs using factory mounting locations and requires no cutting or modifications. All necessary hardware is included for a clean, straightforward installation.
Precision Engineering and Construction
Designed using advanced computer-aided design (CAD) for high-tolerance fitment and 100% MIG-welded for race-proven strength and durability.
Fitment Notes (Wheelbase)
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Regular Cab / Long Bed – 141.5" Wheelbase
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Extended Cab / Short Bed – 162.5" Wheelbase
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Crew Cab / Long Bed – 172" Wheelbase
Additional Information
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Emissions: Does not require a CARB EO number
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Manufacturing: Engineered and manufactured in Corona, California, USA
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Warnings: Prop 65 – Cancer and Reproductive Harm
Vehicle Fitment
Chevrolet
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2020–2025 Silverado 2500 HD | 6.6L Gas
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2020–2025 Silverado 3500 HD | 6.6L Gas
GMC
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2020–2025 Sierra 2500 HD | 6.6L Gas
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2020–2025 Sierra 3500 HD | 6.6L Gas
Upgrade your HD truck with the Apollo GT Series 4-Inch Cat-Back Exhaust System for deep exhaust tone, increased flow, and durable stainless steel performance.
