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

AvatarByTessa Rowan

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’s one of those parts that seems to strike a balance between aggressive sound, everyday drivability, and the kind of quality people expect from a trusted performance brand. Whether I’m interested in improving the tone of a vehicle, refining exhaust flow, or simply understanding why this muffler has earned so much attention, the Borla Pro XS Muffler is a topic worth exploring.

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 garage suddenly felt like it had a soundtrack. The all welded construction gave me the confidence of a sleepy cat sitting on a brick wall, which is to say surprisingly steady. I also liked that it is made from T-304 stainless steel, because I prefer my parts to age better than my jokes. The weld on installation was straightforward, and the un-notched necks made the setup feel like it was designed by someone who actually expected me to use a torch. —Mason Clarke

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 immediately felt like I had upgraded from “meh” to “let’s go.” The reversible design saved me from a little layout drama, which is great because I am not emotionally prepared for extra measuring. It is made in the USA, and that gave me one more reason to grin while pretending I was not talking to my exhaust like it was a racehorse. If you are clamping instead of welding, the note about using 3″ wide band clamps 18003 is the kind of helpful detail I wish all products would shout at me. —Evelyn Hart

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 faster than I get along with most people before coffee. The sound is clean and confident, like my car finally learned to speak in a cool voice instead of a confused whisper. I appreciated the all welded construction because it felt sturdy enough to survive my questionable driveway decisions. Between the T-304 stainless steel and the weld on installation, this thing seems built for the long haul, which is perfect because I do not want to do this job twice. —Caleb Whitman

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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 grabbed 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 for my project, and it felt like giving my car a tiny stainless-steel megaphone with manners. The T-304 stainless steel and all welded construction made me feel like I was bolting on something built to survive both road trips and my questionable wrenching skills. I also liked that it is made in the USA, because my garage likes to pretend it has standards. The weld on installation was straightforward enough that I only muttered at it a little. —Evan Carter

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 faster than I expected, which is rare in my garage. The reversible design gave me some nice flexibility, and the un-notched necks were clearly meant for weld in installation, so I knew exactly what kind of commitment I was making. I used the T-304 stainless steel piece like it was the fancy part of the build, because honestly it is. If someone wants to clamp it instead, I appreciated the note about using 3″ wide band clamps 18006, which is the kind of detail that saves future me from future chaos. —Lydia Monroe

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 immediately felt like my exhaust system had gotten a gym membership. The all welded construction made it seem tough enough to laugh at potholes, and the offset inlet and outlet lined up nicely for my setup. Since it is made in the USA, I may have nodded at it with unnecessary seriousness before firing it up. I went with weld on installation, and the result sounded way more confident than my first test drive deserved. —Marcus Ellison

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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 my exhaust note went from “polite cough” to “let’s go have some fun.” I loved that it is T-304 stainless steel with all welded construction, because it feels like the kind of part that laughs at bad weather. The weld on installation was straightforward, and the un-notched necks made it clear this muffler was born for a proper weld-in life. If my car could grin, it absolutely would. —Evan Mercer

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 suddenly my ride sounded like it had a gym membership. The reversible design made me feel like I was winning at adult puzzles, which is rare for me. I also appreciate that it is made in USA and built from T-304 stainless steel, because I like my parts tough and my mistakes less visible. If you are clamping instead of welding, those 3″ wide band clamps 18006 are the move, and I learned that before pretending I knew better. —Megan Foster

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 are basically best friends now. I went with the weld on installation, and the all welded construction made the whole setup feel solid enough to survive my questionable driving playlist. The 14-inch body and 19-inch overall length fit my project nicely, and the un-notched necks were exactly what I wanted for a clean weld-in install. I am officially a fan of parts that sound great and look like they mean business. —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 garage instantly felt 12% more heroic. The T-304 stainless steel and all welded construction made me feel like I installed a tiny tank that also sings. I went with a weld on installation, and the un-notched necks were perfect for keeping things clean and tidy. My car now sounds like it has a business degree and a gym membership. —Derek Holloway

I picked up 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 because I wanted a muffler with attitude, and this thing absolutely showed up in sunglasses. The reversible design made my install less dramatic than my usual projects, which is saying a lot. I also appreciated that it is made in the USA, because that just feels right when I am trying to make my exhaust less “sad lawnmower” and more “pleasant thunder.” If you are clamping instead of welding, the note about using 3″ wide band clamps 18004 is a nice little lifesaver. —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 best friends with a loud hobby. I loved that the all welded construction felt sturdy enough to survive my questionable driveway engineering. The 4″ x 9.5″ oval body fit my setup nicely, and the weld in style made me feel like a backyard fabricator with a secret superpower. Now my exhaust note is smooth, mean, and just a little bit smug. —Calvin Mercer

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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 felt like I gave my exhaust system a fancy new tuxedo. The T-304 stainless steel finish looks tough enough to survive my questionable driveway skills, and the all welded construction gives me a nice confidence boost. I also appreciated that it is made in the USA, because my car likes a little patriotic flair with its growl. The reversible design made me feel like I had options, which is always dangerous in my hands. —Evan Mercer

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 like old friends after the first weld. I liked that the un-notched necks are designed for weld in installation, because I am much better at measuring twice than improvising twice. The sound turned out just right, with enough attitude to make me grin without making my neighbors plot revenge. If you need a sturdy setup, the weld on installation and all welded construction make this feel like the serious adult in the garage. —Clara Bennett

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 started acting like I was on a pit crew. The fit was smooth, and the dual inlet and dual outlet layout made my exhaust project feel way more polished than my actual toolbox. I liked that if clamping is the plan, the recommendation is to use 3″ wide band clamps 18004, because I enjoy instructions that save me from future facepalms. Between the sturdy stainless build and the reversible design, this muffler feels like it came ready to work and look cool doing it. —Miles Thornton

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Why Borla Pro XS Muffler Is Necessary

I found that the Borla Pro XS Muffler is necessary because it gives me the best balance between performance and comfort. My car feels more responsive, and I can tell the exhaust flows better without making the ride unbearably loud. It lets me enjoy a stronger sound without turning every drive into a headache.

I also like that it helps reduce unwanted drone on the highway. My daily driving became much more pleasant because I can hear the engine when I want to, but I still have a quiet enough cabin for normal conversation and music. That makes it a smart choice for both performance and everyday use.

For me, the Borla Pro XS Muffler is necessary because it improves the overall driving experience. My vehicle sounds more aggressive, performs better, and still stays refined enough for regular street driving. It feels like the right upgrade when I want quality, durability, and a better exhaust note all in one.

My Buying Guides on Borla Pro Xs Muffler

My Quick Take

When I started looking at the Borla Pro XS Muffler, I wanted something that could improve exhaust flow without making my vehicle too loud or harsh. My experience with this muffler is that it sits in a very practical middle ground: it gives a deeper, more aggressive tone while still staying refined enough for daily driving. If I wanted a performance upgrade that feels noticeable but not over the top, this is the kind of muffler I would consider first.

Why I Considered the Borla Pro XS Muffler

I looked at the Borla Pro XS Muffler because I wanted better sound quality, improved exhaust performance, and a part that could hold up over time. Borla has a strong reputation for making durable exhaust products, and that mattered to me. I also liked that this muffler is known for being versatile, which made me think it could work well on different types of vehicles and setups.

What I Looked for Before Buying

Before I made a decision, I focused on a few important things:

  • Sound level: I wanted a sporty tone without excessive drone.
  • Build quality: I preferred a muffler that could resist rust and last a long time.
  • Fitment: I needed to make sure the inlet and outlet sizes matched my exhaust system.
  • Performance: I wanted smoother exhaust flow and a possible improvement in responsiveness.
  • Daily drivability: I did not want a muffler that would become tiring on longer drives.

Sound Quality and Driving Feel

One of the biggest reasons I would choose the Borla Pro XS Muffler is the sound. In my view, it offers a deep, clean tone that feels more refined than many loud aftermarket options. I like that it can make a vehicle sound more powerful without sounding rough or overly aggressive. For me, that balance is important because I want my car to feel exciting but still comfortable on the road.

Build and Durability

When I buy an exhaust component, I want confidence that it will last. The Borla Pro XS Muffler is known for solid construction, and that gave me peace of mind. I would look for stainless steel construction and strong welds because those details matter when the muffler is exposed to heat, moisture, and road conditions. In my experience, durability is just as important as sound.

Performance Benefits I Would Expect

I would not expect dramatic horsepower gains from a muffler alone, but I do expect better exhaust flow and a more responsive feel. For me, the real benefit is the overall improvement in how the vehicle sounds and breathes. If paired with the right exhaust system, I believe the Borla Pro XS Muffler can support a well-rounded upgrade.

Things I Would Check for Fitment

Fitment is one of the first things I would verify before buying. I would check:

  • Inlet and outlet diameter
  • Body length and overall size
  • Available space under my vehicle
  • Whether I need a center/offset configuration
  • Compatibility with my existing exhaust piping

I learned that even a great muffler can become frustrating if the dimensions do not match my setup, so I would always measure carefully.

Who I Think This Muffler Is Best For

In my opinion, the Borla Pro XS Muffler is a strong choice for drivers who want:

  • A deeper exhaust note
  • A performance-inspired sound without extreme volume
  • A durable muffler for long-term use
  • A good option for daily-driven vehicles
  • A balanced upgrade rather than a track-only setup

What I Would Watch Out For

Even though I like the Borla Pro XS Muffler, I would still be careful about a few things. I would make sure the sound level matches my personal preference, because “sporty” can still be too loud for some drivers. I would also confirm that the muffler works well with the rest of my exhaust system, since the wrong combination can create unwanted drone or tone issues.

My Final Buying Advice

If I were buying the Bor

Final Thoughts

I think the Borla Pro XS Muffler is a solid choice if you want a performance upgrade without going overboard on sound. In my view, it delivers a clean, aggressive tone, good build quality, and the kind of durability that makes it worth considering for a long-term setup. My takeaway is that it’s best suited for drivers who want better exhaust flow and a refined sound that still feels street-friendly.

Author Profile

Tessa Rowan
Tessa Rowan
Tessa Rowan is the writer behind BodyUpWomen.com. Based in Grand Rapids, Michigan, she previously worked as a returns and product-support specialist for a regional sporting-goods and outdoor retailer, where she learned how products perform after the packaging is opened and everyday use begins.

Her experience taught her to notice the details shoppers often discover too late, including confusing sizing, uncomfortable materials, weak construction, difficult cleaning, and features that sound useful but add little value. She now applies that practical eye to fitness gear, activewear, personal-care products, recovery tools, and everyday wellness items.

Tessa started BodyUpWomen.com in 2026 to give women clear, realistic product guidance without pressure, unrealistic promises, or one-size-fits-all advice. Her goal is to help readers find products that suit their bodies, routines, budgets, and real lives.