The Flowmaster American Thunder Cat-Back Exhaust System is engineered for drivers of the 2011–2018 Chevrolet Silverado 1500 and GMC Sierra 1500 with the 6.2L engine who want an aggressive exterior tone paired with a moderate interior sound. This high-performance system features a 3.50-inch mandrel-bent inlet pipe feeding into a robust 50 Series HD performance muffler with large internal chambers and a tuned resonance chamber that reduces interior drone while maintaining deep exhaust character.

Dual 2.50-inch mandrel-bent tailpipes exit through your choice of two configurations: behind each rear tire for towing needs or straight-out under the rear bumper for a muscular appearance. The system is crafted from durable stainless steel and finished with polished 3.50-inch stainless steel tips for a premium look.

Designed to fit using factory hanger locations, this bolt-on system includes all necessary hardware for an easy at-home installation. It also clears the factory spare tire and is backed by Flowmaster’s Lifetime Limited Warranty.

Key Features

• Dyno-tuned for maximum performance

• 50 Series HD performance muffler for aggressive-to-moderate sound

• Choice of dual rear or dual side exits

• Stainless steel construction with polished stainless tips

• Uses factory hanger locations

• Clears factory spare tire

• Includes all hardware for an easy installation

• Lifetime Limited Warranty

Fitment

Fits:

• 2011 Chevrolet Silverado 1500 6.2L (Crew Cab/Short Bed 143.5" WB; Crew Cab/Standard Bed 153" WB; Double Cab/Standard Bed 143.5" WB)

• 2012 Chevrolet Silverado 1500 6.2L (same configurations above)

• 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 (Crew Cab/Short Bed 143.5" WB; Crew Cab/Standard Bed 153" WB; Double Cab/Standard Bed 143.5" WB)

• 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

Notes:

• Fits 2WD and 4WD

• Fits Crew Cab/Short Bed (143.5" WB), Crew Cab/Standard Bed (153" WB), Double Cab/Standard Bed (143.5" WB)

• Does not fit Regular Cab models

Specifications 

• Brand: Flowmaster

• Category: Exhaust

• Exhaust Series: American Thunder

• Sound Level: Aggressive / Moderate

• Type: Cat-Back

• Pipe Material: 409 Stainless Steel

• Pipe Color: Silver

• Main Piping Diameter: 2.50 IN

• Inlet Type: Clamp-On

• Exhaust Tip Diameter: 3.50 IN

• Exhaust Tip Finish: Polished

• Exhaust Tip Material: 304 Stainless Steel

• Exhaust Tip Quantity: 2

• Exhaust Tip Shape: Round

• Exhaust Tip Cut: Angled

• Exhaust Tip Wall: Double Wall

• Exit Style: Dual Out Rear or Dual Out Side

• Muffler Series: 50 Series HD

• Muffler Type: Chambered

• Muffler Material: 409 Stainless Steel

• Muffler Finish: Natural

• Muffler Included: Yes

• Muffler Body Length: 18.00 IN

• Muffler Body Width: 10.00 IN

• Muffler Body Height: 5.00 IN

• Tail Pipe Diameter: 2.50 IN

• Tail Pipe Quantity: 2

• Hangers Included: Yes

• Clamps Included: Yes

• Mount Type: Uses factory hangers

• Gasket or Seal Included: No

• Grade Type: Performance

• CARB Compliant: Yes

• Emission Code: 5

• UPC: 700042035038

• California Proposition 65: Yes (Chromium—Hexavalent Compounds)