Gibson 65657 Dual Split Rear Cat-Back Exhaust System Stainless Steel

The Gibson 65657 is a dual split rear cat-back performance exhaust system engineered to deliver measurable power gains, an aggressive deep exhaust tone, and a bold dual-tip appearance. Constructed from mandrel-bent 409 stainless steel tubing, this system is built for long-lasting durability and maximum exhaust flow efficiency.

Key Features:

• Gibson Superflow Muffler — baffled and chambered design with no internal packing; produces a deep, aggressive exhaust note while minimizing interior cabin drone
• Mandrel-bent 409 stainless steel tubing — 3-inch primary / 2.25-inch secondary diameter for consistent, unrestricted flow
• 4-inch polished T304 stainless steel rolled slash-cut tips — clamp-on design with 2.25-inch inlet, 4.0-inch outlet, 12-inch length
• Slip-fit pipe connections — reduce backpressure at joining points for improved exhaust flow
• Dyno-proven performance gains — adds approximately 15–20 horsepower and increases low-end torque in the 2,000–4,000 RPM range
• Dual split rear exit — exits straight out the back; compatible with most factory bumpers, roll pans, and trailer hitches
• Bolt-on installation — includes all hardware and factory-style hangers; no welding required
• Made in the USA — backed by a Lifetime Limited Warranty

Specifications:

• System Type: Cat-Back
• Exit Position: Dual Split Rear
• Exit Style: Straight
• Inlet Size: 2.5 in.
• Outlet Size: 3.0 in.
• Tip Size: 4.0 in.
• Tubing: 3-in. / 2.25-in. 409 Stainless, Mandrel Bent
• Muffler: 4 x 9 x 18 in. Oval Body; 3.00-in. Center Inlet; 2.25-in. Outlet
• Material: Stainless Steel

Note: Exhaust sound may be louder under towing conditions. Split rear systems are not recommended for towing applications due to potential carbon monoxide ingress into the cabin.