Description
Overview
The Flowmaster American Thunder Exhaust System Kit is engineered specifically for the 2024-2026 Ford Mustang, fitting both the 5.0-liter GT and the EcoBoost 2.3L engine equipped with the standard factory non-valved setup. Designed as an axle-back performance exhaust, this kit swaps out the restrictive factory rear section for a purpose-built exhaust system that sharpens tone, improves flow, and gives your car exhaust the aggressive attitude the Mustang deserves.
At the heart of this catback-style upgrade are Flowmaster’s proven Super 44 series mufflers, tuned to deliver a sound level that blends aggressive and moderate character. Whether you’re cruising or laying into the throttle, the Super 44s produce a deep, unmistakable exhaust note without overwhelming the cabin. On the dyno, this exhaust system produced maximum gains of up to 8 horsepower and 6 lb-ft of torque measured at the rear wheels.
Built to Perform and Last
Every exhaust pipe in this kit is crafted from 3.00-inch mandrel-bent 409 stainless steel tubing, maximizing exhaust flow and long-term durability. The blacked-out finish gives the system a stealthy, purposeful look under the car, while dual 4.00-inch polished stainless steel tips with embossed logo add a custom, finished appearance at the rear. It’s the kind of performance exhaust hardware that stands up to serious use while looking factory-plus in every detail.
Key Highlights
- Flowmaster American Thunder axle-back exhaust system for 2024-2026 Ford Mustang (5.0L GT & 2.3L EcoBoost, non-valved)
- Super 44 series mufflers for an aggressive/moderate exhaust tone and increased performance
- Dyno-measured gains of up to 8 hp and 6 lb-ft at the rear wheels
- 3.00-inch mandrel-bent 409 stainless steel tubing with a black pipe and muffler finish
- Dual 4.00-inch polished stainless steel tips with embossed logo
- 16.00-inch overall muffler length, center inlet, dual outlets at 3.00-inch outlet diameter
Easy, Bolt-On Installation
This exhaust system kit uses the factory hangers and mounting locations, and all the necessary hardware is included for a straightforward bolt-on installation. There’s no need to modify your Mustang, making this an ideal weekend upgrade for enthusiasts who want a Borla exhaust or Corsa exhaust level of presence with Flowmaster’s signature sound and value.
Fitment & Coverage
Confirmed to fit both coupe and convertible body styles of the 24-26 Ford Mustang. This system is CARB (California) compliant with Emission Code 5, and carries a California Proposition 65 warning. Backed by Flowmaster’s Lifetime Limited Warranty, it’s a confident choice when you shop for exhaust upgrades that deliver proven performance, aggressive sound, and lasting build quality.
