Gibson Exhaust 65678 Cat-Back Dual Sport Exhaust System Stainless Steel

The Gibson Performance 65678 Dual Sport Cat-Back Exhaust System is engineered for truck and SUV owners who demand a powerful exhaust note, real performance gains, and a clean, distinctive look. The dual outlets exit cleanly behind the rear tire, keeping the exhaust path clear of tow trailers while giving your vehicle a purposeful, sport-inspired stance both on-road and off.

Built from 409 stainless mandrel-bent tubing (3.5-in. primary / 2.25-in. outlet diameter), this system maximizes exhaust flow with no restrictions or kinks through the bends. Every component is fully welded for long-term durability against the elements. Dyno tested and dyno-tuned to its specific application, this system delivers average gains of 18–20 horsepower and 15–20 lb-ft of torque.

Key Features:

• Muffler Design: Baffled and chambered construction — no internal packing, minimal interior drone, aggressive exterior sound
• Muffler Dimensions: 4 x 9 x 18 in. oval body; 3.0 in. center inlet; 2.25 in. dual outlet
• Exhaust Tips: 4 in. polished T304 stainless steel rolled slash-cut tips, clamp-on style
• Tip Specifications: 2.25 in. inlet / 4.0 in. outlet / 12 in. length
• Tubing: 3.5-in. / 2.25-in. 409 stainless steel mandrel-bent tubing
• Dual outlet exit: Pipes exit behind the rear tire — tow-trailer friendly and visually distinctive
• Bolt-on installation: Includes all hardware and factory-style hangers — no welding required
• Made in the USA and backed by a Lifetime Limited Warranty

The Gibson 65678 delivers a deep, authoritative exhaust tone that commands attention without creating annoying interior cabin drone. Whether you're hauling, towing, or hitting the trail, this performance cat-back system is a direct bolt-on upgrade that looks and sounds as good as it performs.