Enhance the sound, performance, and style of your truck with the Flowmaster Flow FX Cat-Back Exhaust System, engineered for the 2011–2018 GM 1500 models equipped with the 6.2-liter V8 engine. Constructed from durable 409 stainless steel, this system features a single 3.50-inch inlet transitioning into dual 2.50-inch mandrel-bent tailpipes for improved exhaust flow and long-lasting reliability.

The Flow FX straight-through muffler provides a deep, moderate performance tone while maximizing exhaust efficiency. Dyno testing shows gains of up to +11 horsepower and +15 lb-ft of torque at the rear wheels, offering a noticeable boost in performance. This system exits out both sides behind the rear wheels and includes premium 4.50-inch black ceramic-coated stainless steel tips for an aggressive, custom appearance.

Installation is simple thanks to the use of factory hanger locations, factory-style hangers, and the included hardware. The system is backed by Flowmaster’s Lifetime Limited Warranty, offering long-term peace of mind.

Key Features

• Gains up to +11 hp and +15 lb-ft compared to stock
• Straight-through Flow FX performance muffler for improved flow and moderate sound
• Single 3.50-inch inlet to dual 2.50-inch 409 stainless steel tubing
• Dual side exits behind rear wheels
• 4.50-inch black ceramic-coated tips for a premium look
• Includes factory-style hangers and all hardware
• Uses factory mount points for easy installation
• Lifetime Limited Warranty

Specifications

• Brand: Flowmaster
• Category: Exhaust
• Clamping Type: Flat Band
• Clamps Included: Yes
• Emission Code: 5
• Exhaust Series: FlowFX
• Exhaust Tip Color: Black
• Exhaust Tip Connection: Clamp-On
• Exhaust Tip Diameter: 4.50 in
• Exhaust Tip Edge: Rolled
• Exhaust Tip Finish: Black Ceramic
• Exhaust Tip Length: 11.00 in
• Exhaust Tip Material: 304 Stainless Steel
• Exhaust Tip Quantity: 2
• Exhaust Tip Shape: Round
• Exhaust Tip Wall: Single Wall
• Exit Style: Dual Out Side
• Finish: Natural
• Gasket or Seal Included: No
• Grade Type: Performance
• Hangers Included: Yes
• Inlet Type: Clamp-On
• Main Piping Diameter: 2.50 in
• Mount Type: Uses Factory Hangers
• Mounting Bracket Included: Yes
• Muffler Body Height: 5.00 in
• Muffler Body Length: 18.00 in
• Muffler Body Material: 409 Stainless Steel
• Muffler Body Shape: Oval
• Muffler Body Width: 10.00 in
• Muffler Finish: Natural
• Muffler Inlet: Slip-Fit
• Muffler Inlet Inside Diameter: 3.50 in
• Muffler Outlet Diameter: 2.50 in
• Muffler Outlet Quantity: 2
• Muffler Series: FlowFX
• Muffler Type: Absorption
• Pipe Color: Silver
• Pipe Material: 409 Stainless Steel
• Sound Level: Moderate
• Tail Pipe Diameter: 2.50 in
• Tail Pipe Quantity: 2
• Tip Logo: Embossed
• Type: Cat-Back
• Valve Included: No

Fitment 

Compatible Vehicles:
• 2011 Chevrolet Silverado 1500 6.2L
• 2012 Chevrolet Silverado 1500 6.2L
• 2013 Chevrolet Silverado 1500 6.2L
• 2014 Chevrolet Silverado 1500 6.2L
• 2015 Chevrolet Silverado 1500 6.2L
• 2016 Chevrolet Silverado 1500 6.2L
• 2017 Chevrolet Silverado 1500 6.2L
• 2018 Chevrolet Silverado 1500 6.2L
• 2011 GMC Sierra 1500 6.2L
• 2012 GMC Sierra 1500 6.2L
• 2013 GMC Sierra 1500 6.2L
• 2014 GMC Sierra 1500 6.2L
• 2015 GMC Sierra 1500 6.2L
• 2016 GMC Sierra 1500 6.2L
• 2017 GMC Sierra 1500 6.2L
• 2018 GMC Sierra 1500 6.2L

Built for power, sound, and long-term durability, this Flowmaster Flow FX system delivers the ideal combination of performance gains and aggressive styling for your GM 1500.