Gibson Performance Exhaust 65405 Dual Extreme Cat-Back Exhaust System Stainless

The Gibson 65405 Dual Extreme Cat-Back Exhaust System is a bolt-on performance upgrade engineered for maximum low-end power, an aggressive exhaust tone, and a bold dual-exit look. Constructed from 409 stainless steel mandrel-bent tubing in 3.5-inch and 3-inch diameters, this system is dyno-tuned for real-world driving conditions and delivers proven gains right in the RPM range where you use them most.

Dyno-Proven Performance:

• Delivers dyno-proven gains of 10–15 horsepower and 15–20 lb-ft of torque in the 1,800–3,000 RPM range
• Optimized tubing diameter improves engine efficiency and reduces backpressure without sacrificing low-end torque
• CNC mandrel-bent tubing maintains consistent pipe diameter throughout every bend, eliminating flow restrictions

Gibson SuperFlow Muffler:

• Baffled and chambered all-welded design with only 5% exhaust flow restriction — compared to 34%+ in a typical stock muffler
• No internal packing material — sound and flow characteristics remain consistent over the life of the muffler
• Produces a deep, aggressive exhaust note with minimal interior cabin drone

Dual Exit Design:

• Dual pipes exit behind each rear tire at an aggressive angle for a bold, performance street appearance
• Includes a 5-inch polished T304 stainless steel round slash-cut tip (clamp-on; 3-inch inlet, 5-inch outlet, 12-inch length)
• Note: Factory exhaust tips are reused on this application; aftermarket tips are included as listed above

Easy Bolt-On Installation:

• Includes all hardware and factory-style hangers — no welding required
• Designed to integrate with most factory bumpers for a seamless OEM-style fit
• Proudly Made in the USA

Muffler Specifications: 8-inch round body; 3.50-inch center inlet; 3.00-inch dual outlet; 24-inch length. Backed by Gibson's Lifetime Limited Warranty.