When you own a Subaru or a Ford, you likely expect a reliable vehicle that performs consistently across its lifespan. One common question that arises among owners is whether swapping out the factory exhaust system for a aftermarket or performance part will jeopardize the vehicle’s warranty. This guide dives deep into the warranty language, how exhaust modifications are treated by Subaru and Ford, and practical steps you can take to keep your warranty intact while upgrading your exhaust.
Understanding Vehicle Warranty Terms
What a Warranty Covers
A vehicle warranty is essentially a promise from the manufacturer that the car’s critical components will be free of defects for a specified period or mileage. For most new cars, the basic powertrain warranty covers the engine, transmission, and related components. However, the coverage can vary by manufacturer and often excludes “performance modifications” that are not OEM (original equipment manufacturer) parts.
The Role of OEM Parts in Warranty Compliance
Manufacturers stipulate that certain parts must remain OEM to maintain warranty coverage. When a component is removed or replaced with an aftermarket part, the manufacturer can argue that the replacement caused or contributed to the defect. Consequently, they may refuse warranty service or claim that the warranty is voided. Knowing which parts are protected and which are not is crucial before making any changes.
Exhaust System Basics
Components of an Exhaust System
A typical exhaust system includes the catalytic converter, muffler, resonator, exhaust pipes, and headers (for performance vehicles). Each element serves a function: reducing harmful emissions, controlling noise, and ensuring efficient exhaust flow. The entire system is usually engineered to work in harmony with the engine’s tuning and the vehicle’s emission controls.
Why the Exhaust Matters to Vehicle Performance
Modifying or upgrading your exhaust can improve horsepower, torque, and throttle response. It also changes the vehicle’s sound profile and may affect the emissions system. For Subaru’s boxer engine or Ford’s V8, a properly tuned exhaust can enhance performance, but it must be matched to the engine’s specifications to avoid damaging the engine or emission control units.
How Changing the Exhaust Can Impact Your Warranty
Subaru: Warranty Conditions and Exhaust Changes
Subaru’s warranty policy is clear: if you replace a factory-installed exhaust component with an aftermarket part, the warranty for that component is generally voided. However, the rest of the vehicle’s warranty remains intact as long as the replacement is not deemed to have caused the defect. Subaru also recommends that any aftermarket exhaust be installed by a certified Subaru technician or a shop that follows Subaru’s installation guidelines.
Subaru’s 10-year/100,000-mile powertrain warranty and 3-year/36,000-mile limited warranty for most models have specific exclusions for “performance modifications” and “emission control system changes.” This means if you install a high-flow catalytic converter or remove a catalytic converter altogether, you risk voiding the warranty on the entire engine or transmission.
Ford: Warranty Conditions and Exhaust Changes
Ford’s policy is similar: the company explicitly states that the powertrain warranty is void if the exhaust system is removed or altered. Ford also warns that removing the catalytic converter or using a non-Ford exhaust can trigger emissions testing failures. In many states, this is illegal, and the vehicle may not pass inspection, causing additional costs and warranty complications.
Ford’s 5-year/60,000-mile powertrain warranty covers “emission control systems.” If you install an aftermarket exhaust that interferes with these systems, Ford can refuse warranty service or request that the original part be reinstalled.
Common Misconceptions
- “Only the replaced part is affected.” In reality, if an aftermarket exhaust causes a defect, the manufacturer can claim the entire engine or transmission warranty is void.
- “I can fix the defect myself.” Many warranty clauses require that repairs be performed by a certified technician. DIY fixes can be considered non-authorized service, voiding the warranty.
- “The new exhaust will improve everything.” Improperly tuned exhausts can cause engine knocking or low backpressure, ultimately damaging the engine.
Best Practices for Replacing Your Exhaust
Choosing the Right Parts
Start by selecting a part that matches your vehicle’s engine specifications and intended use. For Subaru, aftermarket exhausts that maintain the same catalytic converter rating as the OEM will reduce the risk of voiding the warranty. For Ford, look for parts that are listed in the “Approved Parts” list on the manufacturer’s website.
Ensuring Compatibility with the Vehicle
Before ordering, verify the part number and check the installation instructions. A quick search on the Car Parts Picker will allow you to compare OEM versus aftermarket options and ensure the part will physically fit your vehicle’s chassis and engine bay.
Professional Installation vs DIY
While a skilled mechanic can install aftermarket exhausts, it is often safer to have a shop with a Subaru or Ford certification handle the job. Certified shops follow the manufacturer’s torque specifications and use approved tools. This approach gives you a better chance of keeping your warranty intact. If you choose a DIY approach, make sure you document every step, including torque readings and the exact part numbers used, and keep the shop receipts and receipts from any parts purchased.
FAQs about Exhaust Changes and Warranty
Will a Different Exhaust Affect Emissions?
Yes. The catalytic converter is a key component in reducing harmful emissions. Removing or altering it can cause your vehicle to fail emissions tests. Both Subaru and Ford require the catalytic converter to remain as originally installed to pass state inspections.
Are There Warranty Waivers for Performance Mods?
In some regions, manufacturers offer “performance upgrade packages” that allow certain modifications while preserving the warranty. For example, Subaru’s “Boxer Performance Pack” can include exhaust upgrades approved by the manufacturer. Check with a dealer or consult the owner’s manual for details on any available packages.
What Happens if You Get a DIY Install?
Most warranty clauses state that any service performed by an unlicensed or non-authorized shop can void the warranty. If you install the exhaust yourself, keep detailed records and consider having a certified technician review your work to mitigate risks.
How Car Parts Picker Can Help You Find the Right Exhaust
Using Car Parts Picker to Search OEM and Aftermarket Parts
The Car Parts Picker platform allows you to search by vehicle make, model, year, and engine. It provides part numbers for both OEM and aftermarket components. You can filter results to display only parts that are guaranteed to be compatible, reducing the risk of installation errors that could void your warranty.
Tips for Navigating Carpartspicker.com
- Enter your VIN or select your vehicle’s details to load a comprehensive parts catalog.
- Use the “OEM” filter to view only factory-equivalent parts.
- Compare aftermarket parts side‑by‑side with OEM specifications.
- Read customer reviews and notes for each part”, “many users will mention whether a part is warranty‑safe.
- Export your parts list for your records and to keep a backup of your purchase details.
Why Choosing the Correct Part Protects Your Warranty
When you use the Car Parts Picker to identify a part that matches the original factory specification, you’re effectively ensuring that the aftermarket component will not be the cause of any defects covered by the warranty. The website’s “Warranty Check” feature can verify if a specific part falls under the manufacturer’s warranty terms.
Final Thoughts
Changing your exhaust can bring exciting benefits”, “improved power, a deeper rumble, and a more personalized driving experience. However, it’s essential to balance those gains with the potential impact on your Subaru or Ford’s warranty. By understanding the warranty language, selecting parts carefully, and installing them correctly, you can upgrade your vehicle without risking warranty coverage.
Remember that every manufacturer’s policy is slightly different, so when in doubt, consult your dealer or a certified technician. And if you’re looking to find the right exhaust parts quickly, the Car Parts Picker is an invaluable resource to keep your vehicle on the road”, “and your warranty intact.