How Many Decibels Is a Borla Exhaust: Essential Guide

Borla exhaust systems typically range from 90 to 105 decibels, depending on the specific model and vehicle. This makes them louder than stock but often tunable for a respectable, aggressive sound without being overwhelmingly obnoxious.

Ever wondered about the roar of a Borla exhaust? You’re not alone! Many car owners love the idea of an upgraded exhaust for that sporty sound. But figuring out just how loud it will be can be confusing. Will it be too much? Will it pass noise regulations? We’re here to clear things up with simple, straightforward answers.

This guide will break down what ‘decibels’ mean for your car’s exhaust and help you understand the sound levels you can expect from Borla systems. We’ll make it easy to pick the right sound for your ride. Let’s dive in and make your exhaust dreams a reality!

Understanding Exhaust Noise: Decibels Explained

When we talk about how loud an exhaust is, we use a unit called a ‘decibel’ (dB). Think of it like measuring temperature in degrees Celsius or Fahrenheit. The decibel scale tells us how intense a sound is. A higher number means a louder sound.

It’s important to know that the decibel scale isn’t a simple straight line. It’s a logarithmic scale. This means that a small increase in decibels actually represents a much bigger jump in loudness. For example, a 10 dB increase is perceived by the human ear as roughly twice as loud! This is a crucial point when choosing an exhaust system.

What is a Decibel (dB)?

A decibel is the standard unit for measuring sound pressure level. It’s a way to quantify how loud or quiet a sound is. Here’s a quick comparison to give you an idea:

Sound Example	Approximate Decibel Level (dB)
Whisper	15-20 dB
Normal Conversation	60 dB
Busy Street Traffic	70-85 dB
Motorcycle (at 50 ft)	85-95 dB
Lawn Mower	90 dB
Car Horn (at 3 ft)	110 dB
Jackhammer	120 dB

As you can see, even sounds we consider common, like busy street traffic, are already quite significant. Anything above the mid-80s starts to get noticeably loud and can become uncomfortable or even harmful with prolonged exposure. This is why understanding decibel levels for aftermarket exhausts is so important.

Why Does Exhaust Sound Level Matter?

Sound level is a big part of why people upgrade their exhaust systems. A stock exhaust is typically designed to be as quiet as possible for comfort and to meet strict noise regulations. An aftermarket exhaust, like a Borla, aims to give your car a more aggressive, sporty, and satisfying sound. But there’s a balance to strike:

Performance Feel: A more audible exhaust can make driving feel more engaging and powerful.
Aesthetics: The sound is part of your car’s overall persona.
Legal Limits: Many areas have laws about how loud vehicles can be, especially in residential areas or at certain times. Exceeding these can lead to fines.
Comfort: While some like it loud, excessive noise can be tiring on long drives or for passengers.
Neighborly Relations: Let’s face it, an overly loud exhaust can upset your neighbors.

Choosing the right sound level ensures you get the benefits of an aftermarket exhaust without the downsides.

Borla Exhaust Sound Levels: What to Expect

Borla is renowned for its high-quality exhaust systems that offer a noticeable step up in sound and performance from factory setups. However, Borla doesn’t make just one type of sound. They offer different series and configurations, each designed for a specific sound profile and loudness.

Generally speaking, Borla exhaust systems are categorized by their sound level. They often use terms like ‘Touring,’ ‘S-Type,’ and ‘Aggressive.’ This is Borla’s way of helping you choose the loudness you’re comfortable with.

Borla Sound Levels Explained:

Touring: This is Borla’s most mild option. It offers a slight increase in volume over the stock exhaust, enhancing the exhaust note with a deeper tone, but remains very much suited for daily driving and long trips. It’s quiet enough not to be intrusive. Decibel levels for Touring systems are typically in the 85-90 dB range.
S-Type (Sport): This is Borla’s most popular option. It provides a significant increase in volume and a more aggressive tone compared to Touring, delivering a sporty sound under acceleration while still being relatively tame during cruising. This is often considered the sweet spot for many enthusiasts. Decibel levels for S-Type systems usually fall between 90-98 dB.
Aggressive (ATAK – Acoustic Power, Technology, and): This is Borla’s loudest and most aggressive offering. ATAK systems are designed for maximum volume and a deep, throaty growl. They are for those who want their car to be heard and are less concerned about subtle sound. These systems can reach up to 100-105 dB or even slightly higher, often pushing the limits of what’s considered comfortable for daily driving for some.

It’s important to remember that these are general guidelines. The exact decibel level can vary based on several factors we’ll discuss next.

Factors Influencing Borla Exhaust Decibel Levels

When you’re looking at “how many decibels is a Borla exhaust,” remember that it’s not a single, fixed number. Several things can influence the final sound output. Understanding these factors will help you make a more informed decision.

1. Exhaust System Series (Touring, S-Type, ATAK)

As we’ve already covered, this is the biggest factor. Borla designs each series with a specific sound output in mind, from their quietest Touring to their loudest ATAK.

2. Vehicle Make and Model

The same Borla exhaust system can sound different on different vehicles. A V8 engine will naturally produce a deeper, louder sound than a 4-cylinder engine, even with the same muffler. The engine’s displacement, horsepower, and the factory exhaust manifolds and catalytic converters all play a role in the final sound your car makes.

3. Exhaust Configuration

Borla offers various configurations:

Cat-Back Systems: These replace everything from the catalytic converter back. They offer a good balance between sound enhancement and regulatory compliance as they don’t alter emissions equipment.
Axle-Back Systems: These are typically simpler and replace only the muffler and tailpipe section. They can offer a noticeable sound change but are often less dramatic than full cat-back systems.
Header-Back Systems: These replace everything from the exhaust headers. They offer significant performance and sound gains but are more involved and can impact emissions.

A system that includes less baffling or fewer mufflers will generally be louder.

4. Resonators and Mufflers

Resonators are designed to cancel out specific sound frequencies, often the annoying drones that occur at certain RPMs. Mufflers are responsible for reducing overall sound. Borla’s different series use different internal designs for their mufflers and may include or exclude resonators to achieve their target sound levels.

5. Installation Quality

A proper installation is crucial. Leaks in the exhaust system, especially before the muffler, can cause unintended noise or alter the sound profile. Ensuring all connections are sealed correctly is vital for both performance and sound.

6. Modifications to Other Exhaust Components

If you’ve modified your catalytic converter (e.g., removed it or replaced it with a high-flow version) or changed your exhaust manifold, this will significantly affect the sound of your Borla exhaust. Emissions regulations regarding catalytic converters are strict in many regions; for example, the U.S. Environmental Protection Agency (EPA) notes their role in emissions control and that tampering can lead to penalties.

How to Find the Decibel Level for a Specific Borla Exhaust

So, you’ve decided you want a Borla, but which one? Finding the exact decibel rating for a specific Borla exhaust system can take a bit of research. Here’s how you can pinpoint the information you need:

1. Check the Borla Website

Borla’s official website is your best resource. They usually provide detailed information for each exhaust system they offer. Look for:

Product Descriptions: These will often mention the sound level (Touring, S-Type, ATAK) and sometimes even specific decibel ratings.
Product Videos: Many product pages feature videos with sound clips of the system installed on a similar vehicle. This gives you an auditory preview.
Specifications: Sometimes, detailed spec sheets are available.

2. Read Product Reviews and Forums

Enthusiast communities and car forums are goldmines of information. Other owners who have installed the system you’re interested in often share their experiences, including:

Sound descriptions: Users will describe the sound in detail, often comparing it to stock or other aftermarket systems.
Observed loudness: While they might not have a decibel meter, users can often give a good sense of how loud it is in real-world conditions.
Drone: Many reviews will mention if there’s an annoying drone at highway speeds.
Installation tips: General feedback on the product.

Use forums dedicated to your specific car make and model for the most relevant feedback.

3. Watch YouTube Videos

YouTube is an incredible resource for exhaust sound comparisons. Search for the specific Borla system and your vehicle’s make and model. Look for videos that:

Feature an “In-Car” Sound Clip: This gives you the best idea of what it sounds like from the driver’s seat.
Include “Outside” Sound Clips: Shows how it sounds to bystanders.
Are Filmed Accurately: Microphone quality and placement can affect sound perception. Look for reviewers who use decent equipment and explain their setup.
Mention the Exact System: Make sure the video is for the specific Borla series and part number you are considering.

4. Contact Borla or a Reputable Dealer

If you can’t find the information you need online, don’t hesitate to reach out directly. Borla’s customer service team is usually very knowledgeable and can provide specific decibel ratings or guidance based on your preferences and vehicle.

You can also consult with a reputable performance shop that specializes in exhaust systems. They’ll have experience with various Borla products and can offer recommendations based on real-world installation knowledge.

DIY Installation vs. Professional Installation

Deciding whether to install your Borla exhaust yourself or have it done professionally is a common consideration. Both have their pros and cons, and the best choice depends on your comfort level, tools, and available time.

DIY Installation

Pros:

Save Money: Avoid labor costs.
Sense of Accomplishment: Great for learning and pride in your work.
Flexibility: Do it on your own schedule.

Cons:

Requires Tools: You’ll need specific tools like a lift or jack stands for safety, wrenches, socket sets, possibly an exhaust hanger removal tool, and penetrating oil for stubborn bolts. Resources like Popular Mechanics often list essential auto tools.
Can Be Difficult: Exhaust bolts can rust and be extremely hard to remove. Alignment can be tricky.
Safety Risks: Working under a vehicle without proper support is dangerous.
Potential for Errors: Incorrect installation can lead to leaks, rattles, or damage.

Professional Installation

Pros:

Expertise: Technicians have the experience and tools to do the job correctly and efficiently.
Speed: Usually much quicker than a DIY job.
Warranty: Many shops offer a warranty on their labor.
Safety: Performed in a controlled environment with proper safety equipment.

Cons:

Cost: You’ll pay for the labor, which can add a significant amount to the total cost of your exhaust system.
Scheduling: You need to book an appointment and work around the shop’s availability.

Recommendation: If you’re new to car modifications or don’t have the right tools and a safe space (like a garage with a lift), professional installation is highly recommended. They can ensure the Borla exhaust is fitted correctly, maximizing its sound and performance benefits while ensuring safety and proper sealing.

Maintaining Your Borla Exhaust System

Once your Borla exhaust is installed, a little maintenance will keep it sounding great and performing optimally for years to come. You don’t need to be a master mechanic to do this!

Regular Inspection

Periodically (e.g., every few months or during oil changes), get under your car and visually inspect the exhaust system:

Look for rust or damage: Check the pipes, muffler, and hangers. Small rust spots can be treated.
Check for leaks: Listen for any unusual hissing or puffing sounds, especially when the engine is cold. Black, sooty marks around joints can indicate a leak.
Inspect hangers: Ensure rubber hangers are intact and not cracked or broken, as this can cause the exhaust to sag or rattle.

Cleaning

The exterior of your Borla exhaust can get dirty from road grime, exhaust soot, and salt (in winter climates). Keep it looking good:

Wash regularly: Use car wash soap and water.
Detergents: For tougher grime, a degreaser or a dedicated metal polish can be used. Always test in an inconspicuous spot first.
Stainless Steel Polish: If your Borla system is stainless steel (most are), regular polishing will keep it looking shiny and prevent corrosion. Follow product instructions carefully.

Addressing Drone

Some Borla systems, particularly the more aggressive ones, can sometimes produce an unpleasant drone at specific highway speeds (e.g., 2000-2500 RPM). This is a subjective issue, but if it bothers you:

Check for rattles: Ensure no heat shields or other components are loose and vibrating at certain frequencies.
Consider a resonator: In some cases, adding an aftermarket resonator (sold separately) can help reduce highway drone without significantly muting the system’s overall tone. This is a more advanced modification.
Driving style: Sometimes, slight adjustments to your driving speed can help avoid the drone RPM range.

Borla’s ‘Touring’ and ‘S-Type’ systems are generally designed to minimize or eliminate drone for most applications.

FAQ: Your Borla Exhaust Questions Answered

Q1: Will a Borla exhaust make my car illegal?

A: Not necessarily. Borla exhaust systems are designed to be emissions-compliant for most regions when installed as a cat-back system and you retain your catalytic converter. However, sound regulations vary greatly by city, state, and country. Borla’s ‘Touring’ and ‘S-Type’ are generally well within acceptable limits for most areas, but their ‘Aggressive’ (ATAK) systems can be very loud and might exceed local noise ordinances. Always check your local laws regarding vehicle sound limits before purchasing.

Q2: How much louder is an S-Type Borla exhaust compared to stock?

A: An S-Type Borla exhaust is significantly louder than a stock exhaust. While stock systems aim for quietness (often in the 70-80 dB range for cruising), an S-Type typically falls between 90-98 dB depending on the vehicle and specific application. This provides a noticeable, sporty sound increase without being overwhelmingly loud for daily driving.