21-26 Ford F-150 3.5L Powerboost Flowmaster 818166 American Thunder Cat-Back Exhaust System

Flowmaster American Thunder Cat-Back Exhaust System - Part Number 818166

The Flowmaster American Thunder Cat-Back Exhaust System (Part Number 818166) is engineered specifically for the 2021-2026 Ford F-150 equipped with the 3.5L PowerBoost Hybrid engine. Built from durable 16-gauge 409 stainless steel with mandrel-bent tubing, this performance exhaust system is designed to improve exhaust flow while delivering long-lasting durability. A specially tuned resonator produces a deep, moderate-to-mild performance tone that enhances the driving experience without excessive interior drone. Finished with a large 5.00-inch black ceramic coated 304 stainless steel exhaust tip, this system provides a clean, aggressive appearance that complements the F-150's styling. Designed to utilize the factory hanger locations, the kit includes all required hardware and installation instructions for a straightforward at-home installation. Backed by Flowmaster's Lifetime Limited Warranty, this American Thunder exhaust system is an excellent upgrade for drivers looking to improve performance, sound, and appearance.

Key Features

• Designed for 2021-2026 Ford F-150 equipped with the 3.5L PowerBoost Hybrid engine.
• American Thunder Cat-Back exhaust system.
• Constructed from durable 16-gauge 409 stainless steel tubing for long service life.
• Mandrel-bent 3.00-inch and 3.50-inch tubing promotes improved exhaust gas flow.
• Specially tuned resonator delivers a deep, moderate-to-mild performance exhaust tone.
• Includes one 5.00-inch round black ceramic coated 304 stainless steel exhaust tip.
• Rolled edge, angle-cut exhaust tip provides a custom performance appearance.
• Single rear exit configuration.
• Uses factory hanger locations for an easy installation.
• Includes clamps, hangers, installation instructions, and all necessary hardware.
• Chambered muffler with black high-temperature paint finish.
• Clamp-on exhaust tip and inlet connections.
• Natural finish 409 stainless steel piping.
• Does not fit models equipped with the OEM Active Exhaust option.

Benefits

• Improves exhaust flow through mandrel-bent stainless steel tubing for enhanced performance.
• Produces a refined, deep exhaust note with a moderate-to-mild sound level suitable for daily driving.
• Adds an aggressive, custom appearance with a large black ceramic coated exhaust tip.
• Durable stainless steel construction helps resist corrosion and extends service life.
• Direct-fit design utilizes factory mounting locations, reducing installation complexity.
• Complete installation hardware is included for added convenience.
• Backed by Flowmaster's Lifetime Limited Warranty for long-term confidence.
  

Product Specifications

• Brand: Flowmaster
• Part Number: 818166
• Product Type: Cat-Back Exhaust System
• Exhaust Series: American Thunder
• Main Piping Diameter: 3.50 inches
• Additional Tubing Size: 3.00 inches
• Tubing Material: 16-gauge 409 Stainless Steel
• Pipe Color: Silver
• Pipe Finish: Natural
• Muffler Included: Yes
• Muffler Type: Chambered
• Muffler Material: 409 Stainless Steel
• Muffler Finish: Black High-Temperature Paint
• Muffler Shape: Oval
• Muffler Dimensions: 15.00 in. L x 10.00 in. W x 5.00 in. H
• Exhaust Exit Style: Single Rear Exit
• Sound Level: Moderate/Mild
• Exhaust Tip Quantity: 1
• Exhaust Tip Diameter: 5.00 inches
• Exhaust Tip Length: 12.00 inches
• Exhaust Tip Material: 304 Stainless Steel
• Exhaust Tip Finish: Black Ceramic Coating
• Exhaust Tip Shape: Round
• Exhaust Tip Style: Rolled Edge, Angle Cut
• Exhaust Tip Connection: Clamp-On
• Tail Pipe Outside Diameter: 3.50 inches
• Clamps Included: Yes
• Hangers Included: Yes
• Catalytic Converter Included: No
• California Proposition 65: Yes
• CARB Compliant: Yes
• UPC: 090127844762

Install Difficulty Level

Difficulty: Easy.

This direct-fit cat-back exhaust system is designed to install using the factory hanger locations and includes all necessary hardware and installation instructions. No cutting or welding is required, making it a great upgrade for experienced DIY installers. The shortest published installation time is approximately 1 hour under normal shop conditions.

Vehicle Fitment

Fits:

• 2021 Ford F-150 3.5L PowerBoost Hybrid
• 2022 Ford F-150 3.5L PowerBoost Hybrid
• 2023 Ford F-150 3.5L PowerBoost Hybrid
• 2024 Ford F-150 3.5L PowerBoost Hybrid
• 2025 Ford F-150 3.5L PowerBoost Hybrid
• 2026 Ford F-150 3.5L PowerBoost Hybrid

Note: Does not fit models equipped with the OEM Active Exhaust option.

For questions about this product or to report product description inaccuracies, contact the MPT Performance experts at (407) 636-7077 or by email.