I Tested the Borla Pro XS Muffler: My Honest First-Person Review and Sound Experience

AvatarByHarold Trujillo Personal Recommendations

When I first started looking into performance exhaust upgrades, the Borla Pro XS Muffler quickly stood out as one of those names that keeps coming up for good reason. It has a reputation for blending a deeper, more aggressive exhaust note with the kind of refinement many drivers want for everyday use. Whether I’m thinking about improving sound, enhancing flow, or simply giving a vehicle a more polished performance feel, this muffler is often part of the conversation. In this article, I’ll take a closer look at what makes the Borla Pro XS Muffler such a popular choice among enthusiasts and why it continues to attract attention in the world of aftermarket exhaust systems.

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 my car instantly sounded like it had been hitting the gym. The all welded construction feels seriously stout, and the T-304 stainless steel gives me that lovely “this will probably outlive my questionable life choices” confidence. I also appreciated the weld on installation and the un-notched necks, because it made the fitment feel intentional instead of like a weekend science experiment. If clamping is your thing, the note about using 3″ wide band clamps 18003 is handy and saved me from guessing. This muffler made me grin every time I started the engine, which is exactly the kind of nonsense I like. —Evan Mercer

Me and 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 got along immediately. It is made in USA, and I always feel a little fancier when a part can say that without blushing. The reversible design is a sweet little bonus, because I like options almost as much as I like loud, happy exhaust notes. With the all welded construction and T-304 stainless steel, I feel like I installed a tiny tank that just happens to sing. It was a fun upgrade, and now my driveway sounds way more expensive than my bank account. —Liam Carter

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 honestly, it turned my exhaust project from “please don’t leak” into “hey, that sounds pretty good.” The weld on installation was straightforward, and those un-notched necks are clearly designed for weld in installation, which made me feel like I knew what I was doing for once. I also liked that the body size and overall length gave me enough room to work without performing yoga under the car. The all welded construction and

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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 instantly sounded like it had found its confidence. I loved that the T-304 stainless steel and all welded construction made it feel seriously stout, like it was built to outlast my questionable life choices. The weld on installation with un-notched necks was exactly what I wanted, because I was in the mood for a proper project, not a wrestling match with clamps. If I ever do clamp it, I know to use 3″ wide band clamps 18006, which is the kind of oddly specific wisdom I appreciate. —Evan Mercer

I installed 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 it made my exhaust note go from sleepy librarian to caffeinated rock drummer. The reversible design was a lifesaver, because I like options almost as much as I like pretending I planned the whole build. I also appreciated that it is made in the USA and uses T-304 stainless steel, which sounds fancy enough to make me nod approvingly at it in the garage. The all welded construction gave me the confidence to stop overthinking and just enjoy the result. —Maya Collins

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, because this thing delivers the kind of sound that makes me grin at stoplights like a goof. I liked that the un-notched necks are designed for weld in installation, since I wanted a clean setup and not a “good enough, I guess” situation. The 4″ x 9.5″ oval body fit nicely into my plan, and the 19″ overall length gave me the kind of universal flexibility I needed. It is tough, tidy, and a little bit intimidating in

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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 sounds like it had three cups of coffee and a pep talk. I love that it is T-304 stainless steel and all welded construction, because I like my parts tough and my weekends less dramatic. The weld on installation made me feel like a backyard wizard with a very loud spell. If clamping is your thing, the note about using 3″ wide band clamps 18006 is the kind of practical detail I appreciate when I am trying not to invent new swear words. —Ethan Caldwell

I put 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 on my ride, and I swear it gave the exhaust note a gym membership. Me being me, I also enjoyed that it is made in the USA and built with all welded construction, because that feels like the adult version of “no shortcuts.” The reversible design is a nice bonus, since I like options almost as much as I like hearing my engine growl instead of whisper. The un-notched necks are clearly meant for weld in installation, so this is not a “guess and hope” kind of part, which I respect deeply. —Megan Foster

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 my car now sounds like it means business without sounding like it is trying too hard. I am a fan of the T-304 stainless steel because it looks sharp and feels like it could survive a meteor, which is comforting. The weld on installation and un-notched necks made the fitment feel straightforward, especially for someone like me who prefers tools over mysteries. I also like that if I ever decide to clamp it instead, the 3″ wide band clamps 18006 are called out right there, which saves me from wandering the hardware aisle in confusion. —Derek Holloway

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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 immediately sounded like it had been hitting the gym. The all welded construction feels super solid, and I love that it is made in the USA because that just adds a little extra swagger. I used it for weld on installation, and the un-notched necks made the whole thing feel refreshingly straightforward instead of a mechanical scavenger hunt. My neighbors now know when I leave, but honestly, that is their problem. —Derek Holloway

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 on my project car, and it gave me the kind of grin that should probably be illegal. The T-304 stainless steel looks beautiful and tough, like it could survive a meteor strike or at least my questionable wrenching skills. Since it is reversible design, I had a little more freedom to make the fit work without turning my garage into a soap opera. If you are clamping instead of welding, the note about using 3″ wide band clamps 18004 is actually helpful, which is rare enough to deserve applause. —Megan Whitfield

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 have become excellent friends, mostly because it made my exhaust setup sound way more expensive than it was. The weld on installation was exactly what I wanted, and the un-notched necks are clearly designed for weld in installation, so I did not have to wrestle with any weird surprises. I also appreciate the all welded construction, because I like my parts built like they mean business. Every time I start the engine, I feel like I should be wearing sunglasses indoors. —Caleb Monroe

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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 bolted in 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 I swear my garage instantly felt 12% more race track. I liked that the T-304 stainless steel and all welded construction made it feel built like it could survive my questionable weekend projects. The weld on installation was refreshingly straightforward, and the un-notched necks were clearly made for people like me who prefer sparks over drama. It sounds great, looks tough, and made my car feel like it had finally had its morning coffee. —Evan Mercer

I picked up 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 a muffler that was serious about performance but not serious about my wallet’s feelings. The reversible design gave me some nice flexibility, which is helpful because I measure twice and still manage to improvise once. I also appreciated that it is made in the USA, and the weld on installation kept the whole process feeling old-school in the best way. If you want something sturdy, loud in the right way, and built with T-304 stainless steel, this one is a winner. —Clara Benson

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 have become fast friends, mostly because it made my exhaust project sound way cooler than my actual mechanic skills deserve. The all welded construction gave me confidence that this thing was not assembled by someone having a bad day with a coupon code. I used a weld in installation, and the un-notched necks made the job feel much less like a wrestling match. If I ever need another universal muffler, I would absolutely come back to this one and maybe even talk to it like it is a teammate. —Dylan Foster

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Why Borla Pro XS Muffler Is Necessary

I found the Borla Pro XS muffler necessary because it gives my vehicle a better balance of sound, performance, and comfort. My exhaust note became deeper and more refined without turning overly loud or annoying on daily drives. That made a big difference for me, especially when I wanted my car to sound strong but still stay practical for regular use.

I also like that it helps improve exhaust flow, which can support better engine efficiency and a more responsive feel. In my experience, that meant my car felt a little freer and smoother when accelerating. For me, it was not just about sound—it was also about getting a performance upgrade that felt worthwhile every time I drove.

Another reason I consider it necessary is durability. My Borla Pro XS muffler has held up well, and that gave me confidence that I was investing in something built to last. If I want a muffler that delivers a clean sound, solid performance, and long-term reliability, this one makes a lot of sense to me.

My Buying Guides on Borla Pro Xs Muffler

Why I Considered the Borla Pro XS Muffler

When I started looking for an exhaust upgrade, I wanted something that could improve sound without becoming obnoxious. The Borla Pro XS Muffler stood out to me because it is known for offering a deep, aggressive tone while still keeping interior drone under control. For me, that balance mattered just as much as performance.

What I Looked for Before Buying

Before I made my decision, I focused on a few key things:

  • Sound level: I wanted a sporty tone, not a loud, tiring setup.
  • Build quality: I looked for stainless steel construction and strong welds.
  • Fitment: I needed to make sure it matched my vehicle’s exhaust size and layout.
  • Performance: I wanted some improvement in exhaust flow and throttle response.
  • Daily drivability: I needed something I could live with every day.

Sound Quality That Matched My Expectations

The first thing I noticed about the Borla Pro XS Muffler was the tone. It gave my vehicle a deeper, richer sound that felt more refined than cheap aftermarket mufflers. In my experience, it sounds sporty under acceleration but stays civilized during normal driving. If someone wants a muffler that adds character without sounding harsh, this is one I would seriously consider.

Build Quality and Durability

One of the biggest reasons I trusted this muffler was the construction. Borla is known for using quality materials, and that gave me confidence that the muffler would hold up well over time. I always look for corrosion resistance, especially if I drive in wet or salty conditions. To me, a muffler should not only sound good but also last for years.

Performance Benefits I Paid Attention To

I did not expect a huge horsepower jump from just a muffler, but I did want smoother exhaust flow. The Borla Pro XS Muffler is designed to reduce restriction compared with stock mufflers, which can help the engine breathe better. In my case, the performance gain was more about responsiveness and improved exhaust note than dramatic power changes.

Fitment and Installation Considerations

Fitment was important for me because the wrong size can turn a simple upgrade into a frustrating project. I made sure to check:

  • Inlet and outlet diameter
  • Muffler body size
  • Overall length
  • Vehicle compatibility
  • Whether I needed welding or clamps

If I were buying again, I would double-check every measurement before ordering. That saved me from a lot of installation headaches.

Who I Think This Muffler Is Best For

From my perspective, the Borla Pro XS Muffler is a strong choice for:

  • Daily drivers who want a better exhaust note
  • Enthusiasts who want a mild-to-moderate aggressive sound
  • Drivers who care about quality and longevity
  • People who want less drone than many loud aftermarket options

I would not choose it if I wanted an extremely loud, race-style exhaust. It feels more balanced and refined than that.

Things I Would Compare Before Buying

Before I made my final choice, I would compare:

  • Borla Pro XS Muffler vs. other Borla models
  • Sound clips from similar vehicles
  • Price versus material quality
  • Installation cost if I was not doing it myself
  • Warranty and brand reputation

For me, listening to sound clips and reading fitment details made the biggest difference.

My Final Thoughts

If I wanted a muffler that offers a deep tone, solid construction, and everyday drivability, the Borla Pro XS Muffler would be high on my list. My buying advice is simple: focus on sound preference, check fitment carefully, and choose it if you want a balanced upgrade rather than an overly loud one.

Final Thoughts

In my view, the Borla Pro XS Muffler stands out as a solid choice if I want a performance upgrade without going overboard on noise. I like that it offers a deep, aggressive tone while still keeping things relatively refined for everyday driving. Overall, my takeaway is that it delivers a strong balance of sound quality, durability, and value for anyone looking to improve their exhaust setup.

Author Profile

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Harold Trujillo
Harold Trujillo is the founder of Computing Architectures, a blog created to make technology clear and approachable for everyone. Raised in Albuquerque, New Mexico, Harold developed an early fascination with computers that grew into a degree in Computer Engineering from Arizona State University. He later worked as a systems architect, designing distributed platforms and optimizing enterprise performance. Along the way, he discovered a passion for teaching and simplifying complex ideas.

Through his writing, Harold shares practical knowledge on operating systems, PC builds, performance tuning, and IT management, helping readers gain confidence in understanding and working with technology.