Details

• Brand:

  

• SKU:

  86304439

• Other Names:

  Muffler

• Description:

  Give your Sierra increased horsepower and a more assertive sound with the GMC Performance 5.3L Cat-Back Single-Exit Exhaust Upgrade System. This exhaust system offers an increase of up to 7 horsepower and 4 lb.-ft. of torque, while reducing backpressure by 35% at 300-g/s, based on correlated flow testing. Designed and validated by GMC Performance engineers, this 304 Stainless Steel Cat-Back system is tuned to maximize the performance experience while minimizing drone. This Performance Exhaust Upgrade System includes the rear muffler assembly, Y-Pipe, exhaust clamps and all necessary mounting hardware. It is 50-state emissions legal and will not void the New Vehicle Limited Warranty.

  
  

  5.3L Cat-Back Single-Exit Exhaust Upgrade - GM Parts Pro (86304439)

  The 5.3L Cat-Back Single-Exit Exhaust Upgrade - GM Parts Pro (86304439) is a genuine OEM performance exhaust system designed to enhance exhaust flow, vehicle sound, and rear exterior appearance on compatible vehicles equipped with a 5.3L engine. Manufactured to GM Parts Pro’s exact factory specifications, this cat-back exhaust upgrade provides precise fitment, dependable performance, and seamless integration with the original exhaust mounting points and vehicle systems.

  Constructed from high-quality automotive-grade exhaust materials, this system is engineered to withstand extreme heat, moisture, vibration, road debris, exhaust gases, and demanding driving conditions. Its durable tubing, muffler components, hangers, connections, and exhaust outlet help resist corrosion, cracking, deformation, and premature wear, supporting reliable long-term performance.

  Functionally, the cat-back exhaust upgrade replaces the exhaust components located behind the catalytic converter, helping optimize the flow of exhaust gases through the system. Its single-exit configuration delivers a clean, performance-inspired appearance while maintaining a vehicle-specific layout engineered for proper clearance and operation.

  The system is designed to match the vehicle’s original exhaust routing, pipe dimensions, hanger locations, connection points, underbody clearances, and 5.3L engine requirements. Replacing damaged factory exhaust components or upgrading to this OEM system can help restore dependable exhaust operation while providing a more distinctive driving experience.

  As a genuine GM Parts Pro OEM performance accessory, this cat-back exhaust system is manufactured to precise factory dimensions, material standards, acoustic requirements, mounting specifications, flow characteristics, and fitment tolerances. OEM engineering helps ensure compatibility with surrounding suspension, frame, body, and exhaust components without the extensive modification commonly required by universal aftermarket systems.

  Installation is recommended when upgrading the vehicle’s exhaust system, replacing worn or damaged exhaust components, improving rear exterior styling, or restoring proper exhaust flow. Professional installation is recommended to ensure secure connections, correct alignment, adequate underbody clearance, and dependable long-term performance.

  • Genuine GM Parts Pro OEM 5.3L cat-back exhaust upgrade

  • Single-exit configuration provides a clean performance appearance

  • Helps support efficient exhaust-gas flow

  • High-quality automotive-grade exhaust construction

  • Engineered to withstand heat, vibration, moisture, and road debris

  • Precision-designed for factory mounting points and clearances

  • Enhances exhaust performance while maintaining OEM fit and durability

  Choosing the 5.3L Cat-Back Single-Exit Exhaust Upgrade - GM Parts Pro (86304439) helps enhance exhaust performance, vehicle sound, and exterior styling while delivering the fit, quality, and durability expected from a genuine GM Parts Pro OEM performance accessory.

  
  

• Notes: System with Polished Tip and GMC Logo.

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