Gibson 5627 Cat-Back Dual Split Exhaust System, Aluminized Steel

The Gibson 5627 Cat-Back Dual Split Exhaust System is engineered for truck enthusiasts seeking an aggressive exhaust note and measurable performance gains. Built from 2.25-inch mandrel-bent aluminized steel tubing, this system reduces backpressure and optimizes exhaust flow to deliver real-world torque and horsepower improvements averaging 15–20 horsepower — gains delivered in the 2,000–4,000 RPM range where street drivers actually use them.

At the heart of the system is Gibson's Superflow Baffled and Chambered Muffler — a patented design that uses no internal packing for improved volumetric efficiency, minimal interior drone, and a deep, aggressive exhaust tone. The dual tips exit straight out the back for a clean, symmetrical appearance that works with most factory bumpers, roll pans, and trailer hitches.

Muffler Specifications:

• Body: 4 x 9 x 18 in. oval
• Center Inlet: 3.00 in.
• Dual Outlet: 2.25 in.
• Design: Baffled and chambered, no internal packing — minimal interior drone

Exhaust Tip Specifications:

• Style: 3.5 in. round slash-cut, clamp-on
• Material: Polished T304 stainless steel
• Inlet: 2.25 in. | Outlet: 3.50 in. | Length: 12 in.

System Features:

• 2.25-inch aluminized mandrel-bent tubing for consistent flow through every bend
• Baffled and chambered Superflow muffler — no internal packing
• Dual polished T304 stainless steel slash-cut tips exit straight out the back
• Compatible with most factory bumpers, roll pans, and trailer hitches
• Includes all hardware and factory-style hangers for bolt-on installation
• No welding required
• 50-state legal / California emissions compliant
• Made in the USA
• Backed by a Lifetime Limited Warranty

Note: Split rear systems run approximately 5–8 decibels louder than stock. This system is not recommended for towing as carbon monoxide may be drawn into the vehicle. On some 4WD configurations, the spare tire may need to be relocated or removed.