Are Borla Cat Back Exhausts Legal in California? Essential Facts Revealed
Are you thinking about upgrading your car with a Borla cat back exhaust? It’s a popular choice for those wanting better sound and performance.
But before you make the switch, you need to know if Borla cat back exhausts are legal in California. The state has strict rules about vehicle modifications, and ignoring them could lead to fines or problems with your car’s inspection.
Keep reading to find out what the law really says and how you can stay on the right side of it while enjoying the benefits of your upgrade.
California Exhaust Laws
California has strict rules about car exhaust systems. These laws help keep the air clean and reduce noise. Car owners must follow these rules to avoid fines and legal trouble. Knowing these laws helps you decide if Borla cat back exhausts are legal in California.
Emissions Standards
California sets tough limits on car emissions. Exhaust systems must not increase pollution. Any part that affects emissions must be approved by the state. Borla cat back exhausts must meet these standards to be legal.
Noise Regulations
The state controls how loud a car can be. Exhausts that make too much noise are illegal. California measures noise at a specific distance. Borla systems must stay within these sound limits.
Aftermarket Exhaust Restrictions
Aftermarket parts must have proper certification. California requires a CARB (California Air Resources Board) sticker. Without this sticker, the exhaust cannot be used on public roads. Borla cat back exhausts must have this sticker to be legal in California.

Borla Cat Back Exhaust Features
Borla Cat Back Exhausts offer a mix of quality and performance for car enthusiasts. These systems replace the exhaust pipe from the catalytic converter to the rear of the car. They are designed to improve the car’s sound, power, and look. Understanding their features helps to see why they are popular.
Each Borla exhaust system is crafted with care and aims to fit many car models. The features focus on materials, design, and sound to give a better driving experience.
Design And Materials
Borla uses high-grade stainless steel for durability and rust resistance. The pipes have smooth bends to improve exhaust flow. The design fits tightly under the car for a clean look. Welds are strong and neat, showing good craftsmanship. This makes the exhaust last longer and look good.
Performance Benefits
The Borla Cat Back Exhaust helps increase engine power by reducing backpressure. It allows exhaust gases to escape faster. This can improve throttle response and fuel efficiency. Drivers may notice better acceleration and a smoother ride. The system is made for both daily use and spirited driving.
Noise Levels
Borla exhausts produce a deep, aggressive sound without being too loud. The sound is tuned to enhance the car’s natural engine tone. It avoids harsh or annoying noises. Many drivers enjoy the balanced roar during acceleration. Quiet cruising is still possible at low speeds.
Legal Status In California
The legal status of Borla cat back exhausts in California is strict and specific. California has strong laws about vehicle emissions and noise. These laws protect the environment and public health. Borla exhausts must meet these rules to be legal. Understanding these rules helps avoid fines and vehicle issues.
Carb Certification
CARB stands for California Air Resources Board. It sets strict emission rules. Any exhaust system used on public roads must have CARB certification. This certification proves the product meets emission limits. Borla cat back exhausts without this certification are not legal in California. Buyers should check for CARB approval before purchasing.
Executive Orders
Executive Orders (EOs) are official approvals from CARB. They list specific parts allowed for use. Borla exhausts must have a valid EO number to be street legal. The EO number is usually on the product or packaging. Without a proper EO, installing the exhaust is illegal in California.
Common Compliance Issues
Many users face problems due to missing or invalid EO numbers. Some Borla exhausts sold online lack proper certification. Noise level limits are also strict; loud exhausts may fail inspections. Vehicle modifications that affect emissions can cause compliance problems. Always verify the exhaust’s legality before installation to avoid troubles.
Installation And Inspection
Installing a Borla cat back exhaust in California involves careful steps to meet legal standards. Proper installation ensures the exhaust system works well and stays within state laws. Inspections play a key role to verify compliance. Understanding the process helps avoid problems later.
Professional Installation Tips
Choose a skilled mechanic with experience in exhaust systems. Use correct tools to avoid damage during installation. Follow Borla’s instructions closely to maintain warranty and function. Check for leaks and loose parts after fitting. Ensure the exhaust does not exceed noise limits set by California.
Inspection Procedures
California requires an emissions inspection to approve exhaust modifications. Inspectors check for proper catalytic converters and mufflers. Noise levels are measured during the test. The system must pass visual and sound checks. Keep all receipts and documents for proof of legal installation.
Potential Penalties
Failing inspections can lead to fines or orders to remove the exhaust. Authorities may cite vehicles with illegal modifications. Driving with a non-compliant exhaust risks higher penalties. Repeat offenses can cause more severe consequences. Staying within the law protects your vehicle and wallet.
Alternatives For California Drivers
California has strict rules about car exhaust systems. Borla cat back exhausts often do not meet these rules. Drivers in California need options that follow the law and improve their car’s sound and performance. Several alternatives exist to help meet these needs without breaking the rules.
Carb-approved Exhaust Options
The California Air Resources Board (CARB) approves certain exhaust systems. These options meet strict emissions and noise limits. Choosing a CARB-approved exhaust ensures legal use in California. Many brands offer these systems with clear CARB certification. This approval helps avoid fines or vehicle inspections issues.
Custom Exhaust Solutions
Custom exhausts can be made to fit California rules. Skilled shops can design systems with proper emissions controls. These solutions balance sound, power, and legal compliance. Custom work may cost more but offers a tailored option. This approach suits drivers wanting a unique sound without legal risks.
Maintaining Warranty And Compliance
Changing exhausts can affect a car’s warranty. Using legal, approved parts helps keep warranty valid. CARB-approved or custom systems reduce compliance problems. Always check manufacturer and state rules before upgrades. Proper installation and documentation protect from future issues.

Frequently Asked Questions
Are Borla Cat Back Exhausts Street Legal In California?
Borla Cat Back Exhausts are generally not street legal in California. They often lack CARB certification needed for legal use. Always check for a CARB EO number before installation to ensure compliance with state laws.
What Makes Borla Exhausts Non-compliant In California?
Borla exhausts may exceed California’s strict noise and emission limits. Without CARB approval, they fail to meet legal standards. This non-compliance can lead to fines and failed vehicle inspections.
Can I Install Borla Cat Back Exhausts On A California Vehicle?
You can install Borla exhausts if they have CARB certification. Otherwise, installation is illegal and may void your vehicle’s warranty. Verify the product’s compliance before purchasing.
How To Verify If A Borla Exhaust Is Carb Approved?
Check for a CARB Executive Order (EO) number on the product or packaging. You can also search the CARB database online. This confirms legal approval for use in California.
Conclusion
Borla cat back exhausts may not be fully legal in California. The state has strict rules on car parts and emissions. Always check if the exhaust has the right certification. Using parts without approval can lead to fines. Safety and law should come first when modifying a car.
Choose wisely and stay informed to avoid trouble. Your car’s sound and performance matter, but following the law matters more. Stay safe on the road and enjoy driving responsibly.
