Gibson 66550 Cat-Back Dual Extreme Exhaust System Stainless Steel

The Gibson Dual Extreme Cat-Back Exhaust System (PN 66550) is engineered for drivers who demand aggressive performance, bold street presence, and a commanding exhaust note. This dual exit cat-back system features stainless steel construction with mandrel-bent tubing that maintains consistent flow through every bend, reducing backpressure for real-world power gains averaging 15–20 horsepower. The system exits behind each rear tire at an aggressive angle, delivering the signature Dual Extreme look and sound.

At the heart of the system is a Gibson Superflow baffled and chambered muffler—built without internal packing to eliminate restriction while minimizing interior cabin drone. The result is a deep, aggressive exhaust tone tuned specifically for street performance. All components are dyno-tested and application-specific, ensuring a precise fit and maximum power output in the street-driven RPM range of 2,000–4,000 RPM.

Muffler Specifications:

• Design: Baffled & Chambered Superflow — No Internal Packing
• Shape: 7 in. Round
• Center Inlet: 3 in.
• Dual Outlet: 2.50 in.
• Length: 24 in.
• Sound Character: Aggressive, Minimal Interior Drone

Tip Specifications:

• Style: 3.5 in. Round Slash-Cut, Clamp-On
• Material: Polished T304 Stainless Steel
• Inlet: 2.50 in. | Outlet: 3.50 in. | Length: 12 in.

System Features:

• 2.50 in. stainless mandrel-bent tubing throughout
• Dual exit — behind each rear tire
• Includes all hardware and factory-style hangers
• 100% bolt-on installation — no welding required
• Made in the USA
• Backed by a Lifetime Limited Warranty

Sold as a complete kit with everything needed for a straightforward bolt-on installation. Gibson Performance Exhaust is proudly made in the USA and backed by a Lifetime Limited Warranty, making the 66550 a confident upgrade for performance-minded truck owners.