Gibson 618803 Cat-Back Single Exhaust System Stainless Steel Superflow Muffler

The Gibson 618803 Cat-Back Single Exhaust System is a stainless steel performance exhaust upgrade engineered to maximize low-end power output. Dyno-tested to deliver peak torque and horsepower gains in the 1,800–3,000 RPM range, this system averages 10–15 HP and 15–20 lb-ft of torque over stock — making it an ideal upgrade for towing, hauling, hill climbing, and spirited driving.

At the heart of this system is the Gibson Superflow™ Baffled & Chambered Muffler, which uses no internal packing material to deliver aggressive exhaust tone outside the cab while keeping interior drone to a minimum. The exit position behind the rear tire contributes to a quieter in-cab experience compared to other performance exhaust systems.

Muffler Specifications:

• Design: Baffled & Chambered, No Internal Packing
• Body: 6 in. Round
• Inlet: 2.50 in. Offset
• Outlet: 2.50 in. Offset
• Muffler Length: 24 in.
• Sound: Aggressive exterior tone, minimal interior drone

Exhaust Tip Specifications:

• Style: Round Slash-Cut, Clamp-On
• Material: Polished T304 Stainless Steel
• Inlet: 2.50 in.
• Outlet: 3.50 in.
• Tip Length: 12 in.

System Construction & Installation:

• Tubing: 2.50 in. 409 stainless steel, mandrel-bent for consistent flow
• Exit position: Behind rear tire
• Includes all hardware and factory-style hangers
• Bolt-on installation — no welding, no drilling required
• Made in the USA

This complete cat-back kit includes all necessary components for a clean, professional installation. Backed by Gibson's Lifetime Limited Warranty, the 618803 is built to deliver lasting performance and durability.