T304 vs. Aluminized: Which F150 Exhaust Material is Right for You?
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When you start shopping for a Cat-Back Exhaust for your 2021–2025 Ford F-150, you’ll notice a huge price difference. One kit from MBRP might cost $500, while a similar-looking kit from Borla costs $1,500.
They both bend the same way. They both make the truck sound louder. So, where is that extra $1,000 going?
The answer is Metallurgy.
Exhaust systems live a hard life. They are subjected to extreme heat cycles, road debris, rain, and—if you live in the North—corrosive road salt. The material your exhaust is made of (Aluminized Steel, T409 Stainless, or T304 Stainless) determines whether it lasts for the life of the truck or rusts out in three years.
In this guide, we break down the three grades of exhaust metal, helping you decide if you need to pay the premium for "Marine Grade" T304 or if you can save money with Aluminized Steel.
Compare Material Grades
Which steel fits your climate?
|
Material Grade |
Durability |
Cost |
Best For |
|
T304 Stainless |
Lifetime. Will not rust, even in salt belts. |
$$$ (Premium). |
The North. Owners in snowy/salty states who want a "buy it once" exhaust. |
|
T409 Stainless |
High. Develops surface rust but won't rot through. |
$$ (Mid). |
Most Drivers. Good balance of durability and price. |
|
Aluminized Steel |
Medium. Protective coating over mild steel. |
$ (Budget). |
Dry Climates. Great for Arizona/Texas; will rust eventually in snow/salt. |
Frequently Asked Questions (Cat-Back Exhausts)
Does a Cat-Back add horsepower?
Yes, but it's modest. By replacing the crushed factory tubing with mandrel-bent pipe and a straight-through muffler, you reduce backpressure. On a turbo truck (EcoBoost), this allows the turbos to spool slightly faster. Expect gains of 5-10 HP and 10-15 lb-ft of torque, mostly at higher RPMs.
Will it drone on the highway?
It depends on the brand. "Drone" is that annoying vibrating hum that happens at cruising speeds.
- No Drone: Corsa, Borla Touring/S-Type. (Engineered with noise-canceling technology).
- Some Drone: MBRP, Flowmaster Outlaw. (Louder, more aggressive, but audible inside at 70 MPH).
Can I install this in my driveway?
Yes. Cat-Back systems are bolt-on. The hardest part is usually removing the massive one-piece factory exhaust (you might have to cut the stock pipe to get it out if you don't have a lift). The new system clamps together in sections. Plan for 1-2 hours with basic hand tools.
Get the sound you want, legal in all 50 states.
Upgrade your flow and tone with a bolt-on system. Shop our verified collection of 2021–2025 F-150 Cat-Back Exhausts from Borla, MagnaFlow, and MBRP.