Gibson Exhaust 66512 Cat-Back Super Truck Exhaust System Stainless Steel

The Gibson 66512 Cat-Back Super Truck Exhaust System is Gibson's most aggressive cat-back exhaust offering, engineered to deliver a deep, powerful race-rumble tone with real, dyno-proven performance gains. Built from heavy-duty 409L stainless steel mandrel-bent tubing, this system minimizes backpressure and turbulence for maximum exhaust flow efficiency.

At the heart of the system is the Gibson Superflow Muffler — a fully welded, baffled and chambered design with no internal packing. This construction eliminates the power-robbing restrictions of packed or screened mufflers while keeping interior cabin drone to a minimum. Dual tailpipes exit cleanly in front of the rear tires, finished with a 6-inch polished T304 stainless steel oblong slash-cut clamp-on tip.

Key Features:

• Dyno-tested performance gains: Average 10–15 horsepower and 15–20 lb-ft of torque, focused in the critical 1,800–3,000 RPM power band
• 409L stainless steel mandrel-bent tubing: 2.50-inch diameter for consistent, unrestricted exhaust flow
• Superflow Muffler: Baffled and chambered design — no internal packing, aggressive exterior sound with minimal interior drone
• Muffler specs: 7-inch round body; 3.00-inch center inlet; 2.50-inch dual outlet; 19-inch length
• Tip: 6-inch polished T304 stainless steel oblong slash-cut clamp-on tip; outlet 6 x 2.75 inches; 6-inch length
• Dual exit: Tailpipes exit in front of the rear tires for a clean, aggressive look
• Bolt-on installation: No welding required — hassle-free, professional-quality results
• Slip-fit pipe connections reduce backpressure at all joining points
• Proudly made in the USA
• Backed by a Lifetime Limited Warranty

Important Notes: This system is not recommended for heavy-duty towing applications. Noise level may exceed the 95-decibel standard.