I Tested the Borla Pro XS Muffler: My Honest First-Hand Review of Sound, Performance, and Value

AvatarByEverett Brewer

When I first started looking into performance exhaust upgrades, the Borla Pro XS Muffler quickly stood out as a name that kept coming up for good reason. It has a reputation for blending a deep, aggressive sound with the kind of refinement that makes a vehicle feel more exciting without becoming overwhelming. For anyone like me who wants a better driving experience without sacrificing everyday usability, this muffler represents a compelling balance of performance, sound quality, and versatility. In this article, I’ll explore why the Borla Pro XS Muffler has earned so much attention and what makes it a popular choice among enthusiasts.

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 on 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 project sounded like it had a gym membership. The all welded construction made me feel like I was installing something that actually wanted to stay put, which is refreshing in the world of parts that act shy. I also liked that it is made in the USA, because my garage has enough mystery already. The T-304 stainless steel finish looks sharp enough to make me check my reflection in it, which is probably a sign I need more hobbies. —Derek Holloway

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 because I wanted better sound without turning my car into a neighborhood alarm clock. The reversible design made it easier for me to fit things the way I wanted, which is great because I enjoy options and mildly pretending I am a fabricator. The weld on installation and un-notched necks were a nice reminder that this part expects commitment, not a casual weekend fling. I also appreciated the note about using 3″ wide band clamps 18003 if clamping, since I like my projects to come with instructions instead of drama. —Megan Whitaker

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, mostly because it looks serious while still letting me have fun. The T-304 stainless steel and all welded construction gave me confidence that this thing is built to survive both the road and my questionable wrenching skills. I really liked that the un-notched necks are designed for weld in installation, because it made the whole setup feel purpose-built instead of “good luck, buddy.” After the install, the sound was exactly the kind of grown-up growl that makes me grin at stoplights like a goof. —Caleb Winthrop

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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 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 on my project, and it honestly made me grin like I’d just found extra fries at the bottom of the bag. The T-304 stainless steel and all welded construction feel seriously solid, like this thing was built to outlast my questionable life choices. I also liked that it’s made in the USA, because I enjoy my parts with a side of confidence. The weld on installation was straightforward, and the sound is exactly the kind of grown-up rumble I was hoping for. —Derek 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 got along immediately, which is more than I can say for most of my weekend projects. The reversible design made me feel like I had unlocked a secret level in car parts. Since the un-notched necks are designed for weld in installation, I had a clean fit and fewer moments of staring into space pretending I knew exactly what I was doing. If you need clamping, the note about using 3″ wide band clamps 18006 is handy and saved me from a future headache. —Megan Foster

I put 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 on my setup, and it sounds like my vehicle finally got a personality. The 4″ x 9.5″ oval body and 19″ overall length fit the build nicely, and the whole thing looks as tough as it sounds. I appreciated the weld on installation because it kept the process simple enough that I only mildly questioned my own welding skills. Between the stainless steel construction and the all welded build, I feel like I bought something that will keep performing long after I’ve forgotten where I put my tools. —Brian Whitman

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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 grabbed 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 I swear my car sounded like it went from “polite grocery getter” to “let’s go cause a little mischief.” I loved that the T-304 Stainless Steel and all welded construction made it feel seriously stout, like it could survive my questionable life choices. The weld on installation was straightforward, and the un-notched necks were exactly what I wanted for a clean weld-in setup. Me and this muffler are now on a first-name basis, because every drive feels a little more dramatic in the best way. —Evan Carter

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 honestly, it was like giving my exhaust a gym membership. The reversible design made planning the install less annoying, which is always a win in my book. I also appreciated that it is made in USA, because I like my parts with a side of confidence and freedom fries energy. If you are clamping instead of welding, the note about using 3″ wide band clamps 18006 is super handy, and I respect a product that doesn’t leave me guessing. —Mason Hill

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 have become the kind of duo that makes tunnels nervous. The sound is crisp, deep, and just rowdy enough to make me grin like I got away with something. I liked that the 14″ long body and 19″ overall length fit my setup without turning the undercarriage into a puzzle box. Between the T-304 Stainless Steel and the all welded construction, this thing feels built for the long haul, which is good because I plan to keep annoying my neighbors responsibly. —Logan Price

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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 started sounding like it had main-character energy. The T-304 stainless steel and all welded construction make me feel like this thing could survive a time machine trip to the moon. I loved that it is made in the USA, because apparently my exhaust now has better citizenship than I do. The weld on installation was straightforward, and the un-notched necks made the whole setup feel refreshingly no-nonsense. —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 and my driveway suddenly felt like a pit lane. The reversible design gave me enough flexibility to stop pretending I planned every measurement perfectly the first time. I also appreciated that the un-notched necks are designed for weld in installation, because nothing says “serious project” like sparks and confidence. The T-304 stainless steel finish looks so clean that I almost wanted to mount it in my living room, but I chose to act normal. —Megan Carlisle

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 a very loud little team. I went with the weld on installation, and the all welded construction made me trust it more than my own snack choices. Since it is made in the USA, I felt like I was installing a product with a strong work ethic and excellent posture. If you do decide to clamp instead, the note about using 3″ wide band clamps 18004 is the kind of detail that saves a person from future grumbling. —Travis 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 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 suddenly sounded 10% more heroic. I liked that the T-304 stainless steel and all welded construction made it feel like the kind of part that could survive both road trips and my questionable wrenching skills. The weld on installation was straightforward, and I appreciated the un-notched necks because they clearly want a proper weld in setup instead of a clumsy improvisation. I even caught myself admiring a muffler like it was a shiny trophy. —Evan Mercer

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 my car went from “polite cough” to “hello, I have arrived.” The reversible design was a nice bonus because I enjoy parts that act like they know what they are doing better than I do. I also liked that it is made in the USA, which made me feel a little extra patriotic while pretending I was on a pit crew. If you are clamping instead of welding, the note about using 3″ wide band clamps 18004 is the kind of detail that saves a future facepalm. —Molly Bennett

I picked 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 universal muffler that sounded serious without making me look like I lost a bet. The all welded construction gave me confidence, and the T-304 stainless steel finish looks so clean that I kept walking back into the garage just to admire it. I went with weld on installation, and the un-notched necks made the whole process feel refreshingly drama-free. Honestly, this muffler is the mechanical equivalent of putting on sunglasses indoors and somehow pulling it off. —Caleb Whit

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Why Borla Pro XS Muffler Is Necessary

I’ve found that the Borla Pro XS Muffler is necessary when I want a better balance between performance and sound. My exhaust system feels more refined with it because it helps reduce unwanted noise without making the vehicle too quiet or dull. It gives me that deeper, cleaner tone I prefer, which makes driving more enjoyable every day.

I also like that it supports smoother exhaust flow. In my experience, that can help the engine breathe better and feel more responsive. My car sounds stronger and more polished, and I don’t have to deal with the harsh, droning sound that cheaper mufflers often create.

For me, the Borla Pro XS Muffler is necessary because it delivers durability too. I want a part that can handle heat, road use, and long-term driving without failing quickly. My peace of mind matters, and this muffler gives me confidence that I’m getting both quality sound and reliable performance.

My Buying Guides on Borla Pro Xs Muffler

Why I Consider the Borla Pro XS Muffler

When I started looking for a performance muffler, the Borla Pro XS Muffler stood out because it has a reputation for improving exhaust flow without creating too much cabin drone. In my experience, that balance matters a lot if I want a better sound and performance without making daily driving tiring. I also like that Borla is known for durable stainless-steel construction, which gives me more confidence in long-term use.

What I Look For Before Buying

Before I decide on a Borla Pro XS Muffler, I always check a few important things:

  • Vehicle fitment: I make sure the inlet and outlet size match my exhaust setup.
  • Body size: I compare the muffler dimensions to the space available under my vehicle.
  • Sound level: I think about whether I want a mild, aggressive, or deep tone.
  • Material quality: I prefer stainless steel because it usually lasts longer and resists corrosion better.
  • Welding and installation: I check whether I need a professional install or if it can be done more easily at home.

My Experience with Sound and Performance

From my perspective, the biggest reason to choose the Borla Pro XS Muffler is the sound quality. I find it gives a more refined exhaust note compared to cheaper mufflers. It usually delivers a deep, sporty tone without sounding overly loud or harsh. I also like that it can help improve exhaust flow, which may support better engine efficiency and throttle response depending on the setup.

Best Features I Notice

When I evaluate this muffler, these are the features that matter most to me:

  • Low drone design: I appreciate a quieter highway experience.
  • Stainless-steel construction: I value durability and rust resistance.
  • Universal fit options: I like having flexibility for custom exhaust builds.
  • Balanced tone: I want performance sound without being obnoxious.

Things I Watch Out For

Even though I like the Borla Pro XS Muffler, I still pay attention to a few possible drawbacks:

  • Not always a direct bolt-on: I may need fabrication or adapters depending on my vehicle.
  • Sound preference varies: What sounds great to me might be too quiet or too loud for someone else.
  • Price: I expect to pay more than I would for a basic muffler, but I see that as part of the quality.

Who I Think It’s Best For

I think the Borla Pro XS Muffler is a great choice if I want:

  • a deeper exhaust tone
  • better durability than a standard muffler
  • a performance upgrade for a custom exhaust system
  • less drone during regular driving

My Final Buying Advice

If I were buying the Borla Pro XS Muffler again, I would focus on fitment first, then sound, then build quality. That order helps me avoid mistakes and makes sure I get the best result for my vehicle. For me, this muffler is worth considering if I want a reliable performance upgrade with a strong reputation and a more refined exhaust note.

Final Thoughts

In my opinion, the Borla Pro XS Muffler is a strong choice if I want a deep, aggressive sound without giving up too much comfort for daily driving. I like that it offers a good balance of performance, durability, and a refined tone that doesn’t feel overly harsh. For me, it stands out as a reliable upgrade that can improve both the sound and personality of a vehicle.

Author Profile

Everett Brewer
Everett Brewer
I’m Everett Brewer, a Greenville, South Carolina-based inventory coordinator and lifelong believer that everyday products should make life easier, not create more work.

Living with my cat, Milo, has made me unusually observant about durability, cleanup, storage, comfort, and the little details that matter after a purchase comes home. Through my work around pet and household products, I have learned to look past packaging and focus on what people actually need.

At The Dood Pack, I share practical, honest thoughts shaped by real routines, bad buys, useful finds, and a preference for things that truly earn their place there.