What are Subaru exhausts made of?
Subaru exhaust systems are largely built from stainless steel, with some cheaper or older models using aluminized steel in sections; catalytic converters contain precious metals such as platinum, palladium, and rhodium.
Across Subaru's lineup, the materials chosen aim to balance durability, performance, and cost, while standing up to harsh winter driving and road salt common in many markets. Most modern factory exhausts feature stainless steel piping and mufflers, while certain lower-cost trims or older generations may incorporate aluminized steel in some components. The catalytic converter housing is steel, with a ceramic or metal substrate catalyzing reactions, coated with precious metals. The exhaust tips are typically stainless steel, sometimes chrome-plated, and heat shields are usually aluminum or stainless steel.
The following breakdown highlights the most common materials you’ll encounter in Subaru exhausts by component:
- Piping and mufflers: Usually stainless steel, providing corrosion resistance and durability; some entry-level sections may use aluminized steel to save cost.
- Catalytic converters: Have a steel shell and a ceramic or metal substrate with a coating of platinum, palladium, and rhodium to catalyze exhaust emissions.
- Exhaust tips: Typically stainless steel or chrome-plated stainless steel for aesthetics and corrosion resistance.
- Heat shields and supports: Often aluminum or stainless steel to guard surrounding components from heat.
In short, Subaru exhausts are built to endure in varying climates and use cases, with stainless steel as the backbone, reinforced by precious-metal catalysts in the conversion process and corrosion-resistant finishes at the tips.
Summary
Subaru exhaust systems are primarily stainless steel, with aluminized steel used in some models or sections. Catalytic converters rely on precious metals (platinum, palladium, rhodium), and exterior components like exhaust tips are typically stainless or chrome-plated. Material choices vary by model, year, and trim, reflecting a balance of durability, performance, and cost.
What are factory exhausts made of?
Most modern factory exhaust systems are made from 409 stainless steel. It is strong and will last 8-10 years in a moderate climate. 409 stainless steel will rust on the surface. However, this is not a concern for most people because it is hidden under the vehicle.
How do I tell if my exhaust is titanium or stainless steel?
Wanting to briefly summarise the features that divide titanium from stainless steel, we could say that in general a titanium exhaust is on average lighter, even 40% lighter in some cases, and there are some substantial differences in the colour of the two metals.
Are OEM exhausts stainless steel?
Most OEM exhausts are made from mild steel, making them susceptible to rust and corrosion over time.
Are Subaru exhausts stainless steel?
The Subaru Performance Exhaust System is mounted behind the catalytic converter, and features full stainless steel construction.
