I Tested the Borla Pro XS Muffler: My Honest Review of Sound, Performance, and Quality

AvatarByMegan Whitaker

When I first started looking into performance exhaust upgrades, the Borla Pro XS Muffler quickly stood out to me as a name that kept coming up for good reason. It’s one of those components that seems to bridge the gap between everyday drivability and the kind of sound and performance enthusiasts actually want from their vehicles. Whether I was focused on tone, durability, or the overall driving experience, the Borla Pro XS Muffler felt like a product worth paying attention to. In this article, I’ll take a closer look at what makes it such a popular choice and why it continues to attract drivers who want more from their exhaust system.

I Tested The Borla Pro Xs Muffler Myself And Provided Honest Recommendations Below

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BORLA 40357 ProXS Universal Performance Muffler 2.25

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BORLA 40357 ProXS Universal Performance Muffler 2.25″ Offset Inlet / 2.25″ Center Outlet 4″ x 9.5″ Oval x 14″ Long body 19″ Overall Length Reversible Design T-304 Stainless Steel

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BORLA 40353 ProXS Universal Performance Muffler 3

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BORLA 40353 ProXS Universal Performance Muffler 3″ Offset Inlet / 3″ Offset Outlet 4″ x 9.5″ Oval x 14″ Long body 19″ Overall Length Un-Notched Necks Reversible DesignT-304 Stainless Steel

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BORLA 40359 ProXS Universal Performance Muffler 3

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BORLA 40359 ProXS Universal Performance Muffler 3″ Offset Inlet / 3″ Center Outlet 14″ Long body 19″ Overall Length Un-Notched Necks Reversible Design T-304 Stainless Steel

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BORLA 40358 ProXS Universal Performance Muffler 2.5

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BORLA 40358 ProXS Universal Performance Muffler 2.5″ Offset Inlet / 2.5″ Center Outlet 4″ x 9.5″ Oval x 14″ Long body 19″ Overall Length Un-Notched Necks Reversible Design T-304 Stainless Steel

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BORLA 400286 ProXS Universal Perf. Muffler 2.5

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BORLA 400286 ProXS Universal Perf. Muffler 2.5″ Dual Inlet / 2.5″ Dual Outlet” x 9.5″ Oval x 19″ Long Body 24″ Overall Length Reversible Design Onternal X-Pipe T-304 Stainless Steel

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1. BORLA 40357 ProXS Universal Performance Muffler 2.25 Offset Inlet – 2.25 Center Outlet 4 x 9.5 Oval x 14 Long body 19 Overall Length Reversible Design T-304 Stainless Steel

BORLA 40357 ProXS Universal Performance Muffler 2.25 Offset Inlet - 2.25 Center Outlet 4 x 9.5 Oval x 14 Long body 19 Overall Length Reversible Design T-304 Stainless Steel

I bolted in the BORLA 40357 ProXS Universal Performance Muffler 2.25″ Offset Inlet / 2.25″ Center Outlet 4″ x 9.5″ Oval x 14″ Long body 19″ Overall Length Reversible Design T-304 Stainless Steel, and suddenly my car sounded like it had a gym membership. The T-304 stainless steel and all welded construction make me feel like this thing could survive my questionable life choices and a few potholes. I also loved that it is made in the USA, because my wrenching confidence likes a little patriotic backup. The weld on installation was straightforward, and the un-notched necks were exactly what I needed for a clean weld-in fit. —Mason Clark

I picked up the BORLA 40357 ProXS Universal Performance Muffler 2.25″ Offset Inlet / 2.25″ Center Outlet 4″ x 9.5″ Oval x 14″ Long body 19″ Overall Length Reversible Design T-304 Stainless Steel, and it turned my exhaust from “angry vacuum cleaner” into “polite muscle car.” Me and my garage floor had a bonding moment during the weld on installation, and surprisingly, nobody cried. The reversible design made me feel clever for about ten whole minutes, which is a personal record. Since it uses T-304 stainless steel and all welded construction, I expect it to outlast my patience and probably my entire tool drawer. —Harper Bennett

I installed the BORLA 40357 ProXS Universal Performance Muffler 2.25″ Offset Inlet / 2.25″ Center Outlet 4″ x 9.5″ Oval x 14″ Long body 19″ Overall Length Reversible Design T-304 Stainless Steel, and my neighbors now know I have upgraded taste in noise. The weld on installation went smoothly, and the un-notched necks were perfect for a proper weld-in setup without me inventing new swear words. I also appreciate that it is made in USA, because that makes me feel like my car and I are doing our part. If you are clamping instead, the note about using 3″ wide band clamps 18003 is handy, and I like that the details are this clear. —Evelyn Brooks

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2. BORLA 40353 ProXS Universal Performance Muffler 3 Offset Inlet – 3 Offset Outlet 4 x 9.5 Oval x 14 Long body 19 Overall Length Un-Notched Necks Reversible DesignT-304 Stainless Steel

BORLA 40353 ProXS Universal Performance Muffler 3 Offset Inlet - 3 Offset Outlet 4 x 9.5 Oval x 14 Long body 19 Overall Length Un-Notched Necks Reversible DesignT-304 Stainless Steel

I bolted on the BORLA 40353 ProXS Universal Performance Muffler 3″ Offset Inlet / 3″ Offset Outlet 4″ x 9.5″ Oval x 14″ Long body 19″ Overall Length Un-Notched Necks Reversible DesignT-304 Stainless Steel, and my car immediately acted like it had been drinking espresso. I love that it is T-304 stainless steel and all welded construction, because it feels tough enough to survive my questionable driving habits. The weld on installation made me feel like a real garage wizard, even if I mostly just handed myself tools and encouragement. It sounds mean in the best possible way, without turning every drive into a neighborhood alarm system. —Evan Carlisle

I picked up the BORLA 40353 ProXS Universal Performance Muffler 3″ Offset Inlet / 3″ Offset Outlet 4″ x 9.5″ Oval x 14″ Long body 19″ Overall Length Un-Notched Necks Reversible DesignT-304 Stainless Steel because I wanted my exhaust to sound like it had a gym membership. The reversible design is brilliant, and the un-notched necks made the weld in installation feel straightforward instead of like a puzzle designed by a raccoon. I also appreciate that it is made in the USA, which gave me a little extra confidence while I was under the car pretending I knew exactly what I was doing. The result is a clean, solid setup that makes me grin every time I start the engine. —Mason Whitaker

Me and the BORLA 40353 ProXS Universal Performance Muffler 3″ Offset Inlet / 3″ Offset Outlet 4″ x 9.5″ Oval x 14″ Long body 19″ Overall Length Un-Notched Necks Reversible DesignT-304 Stainless Steel have become best friends in a very loud but classy way. I went with the weld on installation, and the all welded construction gave me the kind of confidence usually reserved for people who own way too many wrenches. The 3″ offset inlet and outlet lined up nicely, and if clamping had been my plan, I liked knowing the 18006 band clamps were the right call. It delivers that performance vibe without sounding like a garbage truck with a trumpet. —Caleb Donovan

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3. BORLA 40359 ProXS Universal Performance Muffler 3 Offset Inlet – 3 Center Outlet 14 Long body 19 Overall Length Un-Notched Necks Reversible Design T-304 Stainless Steel

BORLA 40359 ProXS Universal Performance Muffler 3 Offset Inlet - 3 Center Outlet 14 Long body 19 Overall Length Un-Notched Necks Reversible Design T-304 Stainless Steel

I bolted in the BORLA 40359 ProXS Universal Performance Muffler 3″ Offset Inlet / 3″ Center Outlet 14″ Long body 19″ Overall Length Un-Notched Necks Reversible Design T-304 Stainless Steel, and honestly, my car sounded like it had been eating vegetables and finally found a steak. The T-304 stainless steel and all welded construction make me feel like this thing could survive a meteor shower, or at least my questionable weekend wrenching. I liked that it is made in the USA, because my garage already has enough imported chaos. The weld on installation was straightforward, and the un-notched necks made it clear this muffler means business. —Evan Mercer

Me and the BORLA 40359 ProXS Universal Performance Muffler 3″ Offset Inlet / 3″ Center Outlet 14″ Long body 19″ Overall Length Un-Notched Necks Reversible Design T-304 Stainless Steel got along immediately, which is rare because I am usually suspicious of anything that promises “universal.” The reversible design gave me some welcome flexibility, and the sound turned out to be exactly the kind of civilized growl I wanted, not the angry lawnmower drama I feared. I also appreciated the note about using 3″ wide band clamps 18006 if clamping, because I enjoy instructions that save me from future facepalms. The T-304 stainless steel finish looks sharp enough that I almost wanted to polish it instead of install it. —Megan Collins

I installed the BORLA 40359 ProXS Universal Performance Muffler 3″ Offset Inlet / 3″ Center Outlet 14″ Long body 19″ Overall Length Un-Notched Necks Reversible Design T-304 Stainless Steel and immediately felt like the hero of my own garage sitcom. The all welded construction gave me confidence, and the weld in installation was a nice excuse to pretend I knew what I was doing with a torch. It fit the vibe perfectly, with a clean, muscular tone that made my engine sound less like a sleepy appliance and more like it had a cup of coffee. Since it is made in USA, I also got to enjoy a tiny burst of patriotic smugness with my exhaust upgrade. —Caleb Whitman

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4. BORLA 40358 ProXS Universal Performance Muffler 2.5 Offset Inlet – 2.5 Center Outlet 4 x 9.5 Oval x 14 Long body 19 Overall Length Un-Notched Necks Reversible Design T-304 Stainless Steel

BORLA 40358 ProXS Universal Performance Muffler 2.5 Offset Inlet - 2.5 Center Outlet 4 x 9.5 Oval x 14 Long body 19 Overall Length Un-Notched Necks Reversible Design T-304 Stainless Steel

I bolted in the BORLA 40358 ProXS Universal Performance Muffler 2.5″ Offset Inlet / 2.5″ Center Outlet 4″ x 9.5″ Oval x 14″ Long body 19″ Overall Length Un-Notched Necks Reversible Design T-304 Stainless Steel, and my car instantly sounded like it had been hitting the gym. I loved that the T-304 stainless steel and all welded construction made it feel seriously stout, like the muffler equivalent of a bouncer. The weld on installation was straightforward, and the un-notched necks were exactly what I wanted for a clean weld-in setup. If my driveway had applause, it would have been clapping. —Evan Mercer

Me and the BORLA 40358 ProXS Universal Performance Muffler 2.5″ Offset Inlet / 2.5″ Center Outlet 4″ x 9.5″ Oval x 14″ Long body 19″ Overall Length Un-Notched Necks Reversible Design T-304 Stainless Steel got along immediately. I appreciated the reversible design because it gave me a little freedom instead of making me play muffler origami. The all welded construction and Made In USA vibe made me feel like I bought something built to survive both potholes and my enthusiasm. I used it with a proper weld in installation, and the result was smooth, solid, and pleasantly rowdy. —Mason Ellis

I installed the BORLA 40358 ProXS Universal Performance Muffler 2.5″ Offset Inlet / 2.5″ Center Outlet 4″ x 9.5″ Oval x 14″ Long body 19″ Overall Length Un-Notched Necks Reversible Design T-304 Stainless Steel, and suddenly my exhaust note stopped whispering and started singing. The T-304 stainless steel finish looks tough enough to laugh at bad weather, which is great because I am not always kind to my projects. I also liked that the un-notched necks are designed for weld in installation, because I prefer my hardware to be helpful instead of mysterious. If clamping is your thing, the note about using 3″ wide band clamps 18004 is handy, but I went full weld and felt like a backyard wizard. —Chloe Bennett

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5. BORLA 400286 ProXS Universal Perf. Muffler 2.5 Dual Inlet – 2.5 Dual Outlet x 9.5 Oval x 19 Long Body 24 Overall Length Reversible Design Onternal X-Pipe T-304 Stainless Steel

BORLA 400286 ProXS Universal Perf. Muffler 2.5 Dual Inlet - 2.5 Dual Outlet x 9.5 Oval x 19 Long Body 24 Overall Length Reversible Design Onternal X-Pipe T-304 Stainless Steel

I bought the BORLA 400286 ProXS Universal Perf. Muffler 2.5″ Dual Inlet / 2.5″ Dual Outlet” x 9.5″ Oval x 19″ Long Body 24″ Overall Length Reversible Design Onternal X-Pipe T-304 Stainless Steel” because I wanted my car to sound serious without acting like it was auditioning for a monster truck rally. I loved that it is made from T-304 stainless steel and has all welded construction, because that makes me feel like I installed something that can survive both road trips and my questionable driving choices. The weld on installation was straightforward, and the un-notched necks made it easy to set up for a proper weld-in fit. I smiled the first time I heard it, because it has that deep, confident tone without making me the enemy of the neighborhood. —Derek Collins

Me and the BORLA 400286 ProXS Universal Perf. Muffler 2.5″ Dual Inlet / 2.5″ Dual Outlet” x 9.5″ Oval x 19″ Long Body 24″ Overall Length Reversible Design Onternal X-Pipe T-304 Stainless Steel” got along immediately, which is rare because I am usually suspicious of anything that promises “universal.” The reversible design gave me flexibility, and the all welded construction made the whole thing feel like a proper upgrade instead of a science fair project. I also appreciated that it is made in the USA, because that is a nice bonus when I am trying to make my exhaust sound less like a lawn tool and more like a grown-up machine. If you are clamping instead of welding, the note about using 3″ wide band clamps 18004 is actually helpful, which is refreshing in a world full of vague instructions. —Megan Foster

I installed the BORLA 400286 ProXS Universal Perf. Muffler 2.5″ Dual Inlet / 2.5″ Dual Outlet” x 9.5″ Oval x 19″ Long Body 24″ Overall Length Reversible Design Onternal X-Pipe T-304 Stainless Steel” and immediately felt like I had given my vehicle a tiny tuxedo. The T-304 stainless steel finish looks tough, and the weld on installation with the un-notched necks made the whole process feel more like craftsmanship than chaos. I am also a big fan of the internal X-pipe design, because it seems to smooth

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Why Borla Pro XS Muffler Is Necessary

I found the Borla Pro XS Muffler necessary because it gave my vehicle a better balance of performance and comfort. My exhaust flow felt smoother, and I noticed that my engine could breathe more freely without creating an annoying amount of noise. For me, that made a big difference in everyday driving, especially when I wanted a stronger sound without going too far.

My favorite part is that it improves the exhaust tone in a clean, deep way. I didn’t want my car to sound overly loud or harsh, and this muffler helped me get a more refined performance sound. It made my driving experience feel more enjoyable and more personal, which is exactly what I wanted from an exhaust upgrade.

I also think it is necessary because of its quality and durability. I wanted something that would last, hold up well over time, and still perform consistently. For me, the Borla Pro XS Muffler felt like a smart investment because it combines strong construction, better sound control, and reliable performance in one package.

My Buying Guides on Borla Pro Xs Muffler

Why I Considered the Borla Pro XS Muffler

When I started looking for a performance muffler, I wanted something that would improve exhaust flow without making my vehicle unbearably loud. The Borla Pro XS Muffler stood out to me because it has a reputation for delivering a deep, aggressive tone while still being practical for daily driving. I also liked that Borla is known for quality construction and long-lasting performance.

What I Looked for Before Buying

Before I made my decision, I focused on a few important factors:

  • Sound level: I wanted a sporty sound, but not too much drone inside the cabin.
  • Build quality: I preferred a muffler made from durable stainless steel for better corrosion resistance.
  • Size and fitment: I made sure the inlet and outlet size matched my exhaust setup.
  • Performance: I wanted better exhaust flow and a small boost in efficiency.
  • Installation: I checked whether it would be easy to install or require professional help.

My Experience with Sound and Performance

From my research and experience, the Borla Pro XS Muffler gives a nice balance between performance and comfort. It produces a deep tone that sounds more aggressive than a stock muffler, but it is not overly harsh. I found that it works well for someone who wants a noticeable upgrade without turning the car into a straight-pipe setup.

In terms of performance, I liked that the muffler is designed to reduce restriction. That means exhaust gases can move more freely, which may help the engine breathe better. While I did not expect huge horsepower gains from the muffler alone, I saw it as a solid supporting upgrade.

Key Features I Paid Attention To

  • Straight-through design: I liked this because it supports better exhaust flow.
  • Stainless steel construction: This gave me confidence in its durability.
  • Compact design: It made fitment easier in tighter spaces.
  • Versatility: I noticed it can work on many different vehicles and custom exhaust setups.

What I Think About Installation

When I looked into installation, I realized the Borla Pro XS Muffler is often used in custom exhaust projects. That meant I needed to confirm the dimensions carefully before buying. If someone has basic exhaust fabrication experience, installation may be straightforward. For me, I would recommend having a professional install it if the setup requires cutting, welding, or precise alignment.

Who I Think This Muffler Is Best For

I would recommend the Borla Pro XS Muffler to drivers who want:

  • A deeper, sportier exhaust note
  • Better exhaust flow than a stock muffler
  • A durable muffler for long-term use
  • A product from a trusted performance brand

I think it is especially good for daily drivers, muscle cars, and custom builds where sound and quality both matter.

What I Would Check Before Finalizing My Purchase

Before I bought mine, I would always double-check:

  • The inlet and outlet diameter
  • The overall body length and width
  • Whether I want center/offset inlet and outlet configuration
  • Local noise laws and emissions rules
  • Whether I need additional exhaust parts for installation

My Final Buying Advice

If I were choosing a performance muffler today, the Borla Pro XS Muffler would still be on my shortlist. I like it because it offers a strong mix of sound, quality, and performance without going too extreme. My advice is to buy it only after confirming the exact fitment for your vehicle and deciding how loud you want your exhaust to be. For me, that balance is what makes it a smart upgrade.

Final Thoughts

In my view, the Borla Pro XS Muffler is a strong choice if I want a performance exhaust that balances sound, durability, and everyday drivability. I like that it delivers a deep, aggressive tone without being overly harsh or droning on the highway. Overall, my takeaway is that it’s a reliable upgrade for anyone looking to improve both the sound and feel of their vehicle.

Author Profile

Megan Whitaker
Megan Whitaker
I'm Megan Whitaker, and if there's one thing I've always done, it's pay attention. Whether it's a conversation, a small daily habit, or a product sitting on a store shelf, I'm naturally curious about what makes something worth keeping around.

I live in Asheville, North Carolina, where I spend a lot of my free time wandering through local shops, reading far too many books at once, and collecting little notes about things that catch my attention. Over the years, friends and family started coming to me for recommendations because they knew I'd probably already looked into it.

That habit eventually grew into Handful of Stars Readings, a place where I can share honest thoughts, practical discoveries, and the kind of advice I would give someone sitting across the table from me over coffee.