Gibson 615621 Cat-Back Single Side Exhaust System Stainless Steel

The Gibson 615621 Cat-Back Single Side Exhaust System is engineered and dyno-tested to deliver real performance gains for truck and SUV owners. Designed to exit behind the rear tire, this single-side system maximizes low-end torque and horsepower output in the 1,800–3,000 RPM range — exactly where it counts most for acceleration, hill climbing, towing, and passing. Average gains of 10–15 horsepower and 15–20 lb-ft of torque have been recorded on the dyno, while the refined interior design keeps cabin drone to a minimum compared to other performance exhaust systems.

Key Features:

• Cat-back design exits behind the rear tire for a clean, professional appearance
• Dyno-tested performance: average gains of 10–15 HP and 15–20 lb-ft torque at low RPM
• Baffled and chambered muffler design — no internal packing — for aggressive sound with minimal interior drone
• Mandrel-bent stainless steel tubing for optimized exhaust flow and reduced backpressure
• Hassle-free, bolt-on installation — no welding or cutting required
• Backed by Gibson's Lifetime Limited Warranty

Muffler Specifications:

• Shape: 8 in. Round
• Inlet: 3.00 in. Offset
• Outlet: 3.00 in. Offset
• Length: 24 in.
• Design: Baffled and Chambered, No Internal Packing

Exhaust Tip Specifications:

• Style: Round Slash-Cut, Clamp-On
• Material: Polished T304 Stainless Steel
• Tip Diameter: 4 in. outlet
• Inlet: 3 in.
• Length: 12 in.

The Gibson 615621 is a complete cat-back exhaust kit built for performance enthusiasts who want maximum power without sacrificing drivability. The polished T304 stainless steel tip and professional finish make this system as visually impressive as it is functional.