MBRP S5209409 Armor Plus 4" Race Cat-Back Exhaust T409 SS | 2021-2026 Ford F-150 2.7L/3.5L EcoBoost/5.0L

Overview

The MBRP S5209409 Armor Plus 4-Inch Race Cat-Back Exhaust is the ultimate performance exhaust upgrade for 2021–2025 Ford F-150 owners running the 2.7L EcoBoost, 3.5L EcoBoost, or 5.0L V8 who demand an aggressive sound and real performance gains. Built from heavy-duty T409 stainless steel with full mandrel-bent piping and a specially tuned Race Profile muffler, this cat-back system maximizes exhaust flow, reduces back pressure, and unleashes a deep, throaty exhaust note that makes every drive feel track-worthy. Backed by MBRP's industry-leading Lifetime Warranty, the S5209409 delivers best-in-class value for F-150 performance enthusiasts.

Key Features & Benefits

• Race Profile Muffler – Specially tuned muffler produces an aggressive, deep exhaust note under acceleration while remaining civil during normal driving — no obnoxious drone or rasp.
• 4-Inch Full Mandrel-Bent T409 Stainless Tubing – Larger-diameter, mandrel-bent piping eliminates exhaust flow restrictions for gains in horsepower, torque, and throttle response, with potential gains of up to 10% over stock.
• T409 Stainless Steel Construction (Armor Plus Series) – High chromium content provides superior corrosion resistance against rust and oxidation, even in extreme road conditions, salted roads, and wet climates.
• 5" OD Polished Stainless Steel Tip with Embossed MBRP Logo – Gives your F-150 a bold, finished look with a larger-than-stock exhaust tip that makes an unmistakable visual statement.
• Direct Bolt-On Installation – Engineered to bolt straight up to the factory exhaust piping using existing hanger locations — no cutting, welding, or special tools required.
• MBRP Lifetime Warranty – The Armor Plus T409 stainless steel system is backed by a Lifetime Warranty, the best warranty for a T409 exhaust system in the industry.
• Dyno-Tested Performance – Each MBRP system is dyno-tested during R&D and tuned to maximize horsepower, torque, and fuel efficiency gains over the restrictive stock exhaust.
• Welded-On Hangers – Heavy-duty welded hangers align precisely with OEM hanger locations for a secure, rattle-free fit right out of the box.
• CARB Compliant – Meets California Air Resources Board (CARB) emissions requirements, making it street-legal in all 50 states.

Sound Profile

The S5209409 Race Profile cat-back delivers a deep, aggressive exhaust note that wakes up under hard acceleration while remaining surprisingly civil during everyday driving. Owners of the 5.0L V8 describe it as a chest-thumping, deep harmonic V8 rumble at wide-open throttle. EcoBoost owners report that it transforms the turbo V6 into a surprisingly mean-sounding machine. At highway cruise speeds, the note is a light, mellow rumble with minimal interior drone — making it equally suited to long road trips and spirited back-road blasts.

Is this system too loud for daily driving? No. While the Race Profile is MBRP's most aggressive tune, real-world owners consistently report that it is deep and aggressive under throttle but very manageable at steady highway cruise speeds.

What's Included

• 4-Inch T409 Stainless Steel Cat-Back Exhaust Pipe Assembly
• Race Profile High-Flow Performance Muffler
• 5-Inch OD Polished Stainless Steel Exhaust Tip (with embossed MBRP logo)
• Welded Exhaust Hangers
• All Necessary Hardware & Clamps
• Step-by-Step Installation Instructions

Specifications

Manufacturer Part #	S5209409
UPC	882963129482
Series	Armor Plus
Sound Profile	Race (Most Aggressive)
Pipe Diameter	4 Inches
Tip Outer Diameter	5 Inches OD
Tip Finish	Polished Stainless Steel with Embossed MBRP Logo
Material	T409 Stainless Steel
Exit Configuration	Single Side Exit
System Type	Cat-Back
Bending Method	Full Mandrel Bent
Hangers	Welded On, OEM Location
CARB Compliant	Yes — 50-State Legal
Warranty	Lifetime (T409 Armor Plus Series)

Fitment & Compatibility

This MBRP cat-back exhaust system is designed specifically for the 2021, 2022, 2023, 2024, and 2025 Ford F-150 equipped with the following engines:

• 2.7L EcoBoost V6
• 3.5L EcoBoost V6
• 5.0L Coyote V8

Important Exclusions: This system does not fit the F-150 PowerBoost Hybrid, F-150 Raptor, or F-150 Tremor. Please verify your engine and trim before purchasing. Cab configuration, bed length, and truck lift height may affect fitment — consult MBRP's fitment guide or contact support if your truck is modified.

Is this system CARB compliant? Yes. The MBRP S5209409 is CARB compliant and street-legal in all 50 U.S. states.

Installation

The MBRP S5209409 is a direct bolt-on cat-back exhaust replacement requiring light to moderate mechanical skill and only conventional hand tools — no cutting, welding, or drilling required. The system utilizes existing OEM exhaust hanger locations for a precise, vehicle-specific fit. Most experienced DIYers complete the install in approximately 1–2 hours. All necessary hardware and MBRP's detailed step-by-step instructions are included. Note: Depending on your specific bed length and model year, minor pipe trimming may be required. Professional installation is always an option for those who prefer it.

Warranty Registration: To activate your Lifetime Warranty, register your product within 30 days of purchase at MBRP's official warranty registration portal.