Gibson 316611 Cat-Back Single Exhaust System Aluminized Steel 3.5-in Tubing

The Gibson 316611 Cat-Back Single Exhaust System is a high-performance, aluminized steel exhaust designed to deliver maximum low-end torque and horsepower gains where you need them most. Featuring 3.5-in. mandrel-bent aluminized steel tubing, this system reduces backpressure and improves exhaust flow for stronger acceleration, enhanced towing capability, and improved hill-climbing and passing power. The system exits cleanly behind the rear tire and is engineered to keep interior cabin noise lower than competing performance exhaust systems.

At the heart of this system is Gibson's SuperFlow baffled and chambered muffler — a packing-free design that produces a deep, aggressive exhaust tone while minimizing interior drone. Dyno testing confirms peak power gains in the low-end RPM range (1,800–3,000 RPM), with average increases of 10–15 horsepower and 15–20 lb-ft of torque.

Key Features:

• 3.5-in. mandrel-bent aluminized steel tubing for unrestricted exhaust flow
• SuperFlow baffled and chambered muffler — no internal packing, minimal interior drone
• Muffler dimensions: 8 x 11 x 24 in. oval body; 3.50-in. offset inlet; 3.50-in. offset outlet
• Includes 4-in. polished T304 stainless steel round rolled-edge tip (clamp-on style)
• Tip specs: 3.5-in. inlet; 4-in. outlet; 12-in. length
• Single passenger-side exit behind the rear tire
• Includes all hardware and factory-style hangers for bolt-on installation — no welding required
• 50-state emissions legal; will not void factory warranty
• Made in the USA (Corona, CA)
• Backed by a Lifetime Limited Warranty for the original purchaser

Installation is straightforward with all necessary hardware and factory-style hangers included in the kit, making it a true bolt-on upgrade with professional-quality results. The Gibson 316611 is street-legal in all 50 states and will not affect your factory powertrain warranty.