MBRP S5209304 Armor Pro 4" Cat-Back Exhaust Race Profile 304 SS | 2021-2026 Ford F-150 2.7L/3.5L/5.0L

Overview

The MBRP S5209304 Armor Pro 4-Inch Cat-Back Exhaust is the top-tier Race Profile exhaust upgrade for the 2021–2025 Ford F-150 equipped with 2.7L EcoBoost, 3.5L EcoBoost, or 5.0L V8 engines. Built from MBRP's industry-leading T304 stainless steel — the same material used in demanding off-road and extreme-climate environments — this system transforms your truck's near-silent factory exhaust into a deep, chest-thumping roar that commands attention. Engineered for F-150 owners who demand the best combination of aggressive sound, maximum durability, and long-term corrosion resistance, the S5209304 is MBRP's most premium single-exit cat-back solution for the 14th-gen F-150.

Key Features & Benefits

• Race Profile Sound Tuning — Specially engineered muffler and resonator-delete design deliver a deep, aggressive exhaust note under acceleration while minimizing harsh drone at highway cruise speeds. Perfect for the driver who wants maximum presence without sacrificing daily drivability.
• T304 Stainless Steel Construction (Armor Pro Series) — MBRP's most durable material offering, T304 SS is fully rust-proof and built to withstand extreme climates including road salt, snow, and off-road abuse. Unlike T409 or aluminized alternatives, T304 will never corrode or pit, preserving the system's appearance and integrity for the life of your truck.
• 4-Inch Mandrel-Bent Piping — The full 4" diameter, mandrel-bent tubing maintains a consistent bore through every bend, eliminating the flow restrictions of crush-bent factory pipes and maximizing exhaust gas evacuation for potential gains in torque and horsepower.
• Mirror-Polished Double-Wall T304 Stainless Steel Tip (5" OD) — The included 5-inch outside-diameter tip features a double-wall construction in mirror-polished T304 stainless steel. The dual walls create a clean, thick appearance while acting as a heat shield to protect surrounding body panels and the bumper finish.
• Factory Resonator Delete — The system replaces your stock resonator with performance-tuned piping, freeing up additional exhaust flow and contributing to that signature MBRP Race tone without any compromise in fitment.
• Direct Bolt-On Fitment — Engineered to use OEM hanger locations for a precise, rattle-free fit. The bolt-on design requires no cutting or welding on most configurations, making this a straightforward weekend install. Minor trimming may be required on certain extended-wheelbase configurations.
• Lifetime Warranty — MBRP backs all Armor Pro (T304 stainless steel) systems with a no-hassle lifetime warranty, reflecting the brand's confidence in material quality and craftsmanship.
• CARB Compliant — This system meets California Air Resources Board (CARB) emissions compliance requirements, making it street-legal in all 50 states including California.

What's Included

• Complete 4-inch T304 stainless steel cat-back exhaust system
• Race-profile performance muffler
• 5" OD mirror-polished double-wall T304 stainless steel exhaust tip
• All necessary installation hardware (clamps, hangers, fasteners)
• MBRP installation instructions

Specifications

Manufacturer Part #	S5209304
Brand	MBRP
Series	Armor Pro
Sound Profile	Race
Pipe Diameter	4 Inches
Exit Style	Single Side Exit
Tip Outer Diameter	5 Inches
Tip Style	Mirror-Polished Double-Wall T304 Stainless Steel
Material	T304 Stainless Steel
Pipe Fabrication	Mandrel-Bent
Resonator	Resonator Delete
Warranty	Lifetime (Armor Pro)
Weight	63.0 lbs
Package Dimensions	46.5"L × 16.5"W × 12.0"H
UPC	882963129475
CARB Compliant	Yes

Fitment & Compatibility

The MBRP S5209304 is designed to fit 2021–2025 Ford F-150 models equipped with the following engines:

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

⚠ Important Exclusions:

• Does NOT fit PowerBoost hybrid models — The hybrid drivetrain is incompatible with this cat-back system.
• Fits all standard F-150 cab and bed configurations; minor trimming of heat shielding may be required on certain SuperCrew/long-bed combinations.
• Does NOT fit the F-150 Raptor or Tremor.

Is this the best cat-back exhaust for a 2021–2025 Ford F-150 5.0L V8? For owners seeking the most aggressive race-oriented sound with top-shelf T304 stainless construction, the MBRP S5209304 Armor Pro is one of the most capable single-exit cat-back options available for the 14th-gen F-150.

Installation

The MBRP S5209304 is a bolt-on cat-back exhaust system that bolts directly to the factory OEM hanger locations — no welding or cutting required on most standard cab/bed configurations. Most home installers with basic hand tools can complete the swap in under 45 minutes. Minor trimming of factory heat shielding or minor cutting may be necessary on certain extended-wheelbase configurations. Professional installation is recommended if you're unfamiliar with exhaust work. MBRP includes detailed, clearly written installation instructions and all required hardware in the box.

⚠ California Proposition 65 Warning: This product can expose you to chemicals including nickel (metallic) and chromium (hexavalent compounds), which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.p65warnings.ca.gov.