Flowmaster 738170 Signature Series Cat-Back Exhaust System Crew Cab Dual Out Rear

The Flowmaster 738170 Signature Series Cat-Back Exhaust System is a premium performance upgrade engineered for the 2021–2025 Ford F-150 Crew Cab with factory dual exhaust. Built from brushed 304 stainless steel and hand TIG welded in the USA, this system delivers the quality and craftsmanship that sets the Signature Series apart from the competition.

At the heart of this system is the Flowmaster Signature Series straight-through performance muffler, which produces an aggressive yet moderate exhaust tone — bold and authoritative on the outside, comfortable and controlled inside the cab. The system features 3.00-inch mandrel-bent tubing for maximum exhaust flow, reducing backpressure and unlocking measurable gains in horsepower and torque over the factory exhaust.

Key Features:

• 304 stainless steel construction — brushed finish with superior corrosion resistance and long-term durability
• Hand TIG welded in the USA for precision strength and a premium appearance
• Signature Series straight-through muffler — aggressive to moderate sound level, bold outside with a refined interior tone
• 3.00-inch mandrel-bent tubing for optimized exhaust flow and performance gains
• Dual out rear exit configuration designed for Crew Cab F-150 models with factory dual tailpipes
• 4.50-inch PVD-coated black chrome exhaust tips embossed with the Flowmaster logo for a custom, aggressive look
• Uses all factory hanger locations for a straightforward, no-fabrication installation
• Includes all necessary hardware and installation instructions
• Emissions legal for street use
• Backed by Flowmaster's Lifetime Limited Warranty

The Flowmaster 738170 is designed specifically for Crew Cab body style F-150 trucks equipped with factory dual tailpipes. It does not fit models with the OEM active exhaust option. All hardware is included for a bolt-on installation that can be completed at home.