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
Condition: New
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Availability:
In Stock.
Arrives
Friday, Aug 7
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Features
- T-304 Stainless Steel
- Weld On Installation
- All Welded Construction
- Made In USA
- Un-Notched necks are designed for weld in installation. If clamping, use 3" wide band clamps 18006.
Description
Borla Pro XS Muffler; Center/Offset; 3 in. Center Inlet; 3 in. Offset Outlet; 14 in. x 4 in. x 9.5 in. Oval Body; 19 in. OAL; Unnotched; T-304 Stainless Steel;
Brand: Borla
Material: Stainless Steel
Vehicle Service Type: Truck
Item Weight: 3.99 Kilograms
Configuration: Universal
Item Weight: 3.99 Kilograms
Compatible with Vehicle Type: Truck
Configuration: Universal
OEM Equivalent Part Number: 40359
Part Interchange Info: 40359
Material Type: Stainless Steel
Shape: Oval
Brand Name: Borla
Manufacturer Part Number: 40359
UPC: 808422403597
Manufacturer: BORLA
Global Trade Identification Number: 97
Model Number: 40359
Item Type Name: Muffler
Included Components: Muffler
Unit Count: 1.0 Count
Manufacturer Warranty Description: Manufacturer warranty
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Aug 7
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Wow , Just wow , i am amazed at the quality of this product , I have a Focus st it had a straight pipe exhaust on, on 3000 rpm it had 100+ db , after installing this muffler it has dropped down to 68db ! and no power loss whatsoever . It is a very quiet muffler , if you need something more aggressive borla has other options , Thanks to borla team , I am proud That i am a Borla muffler owner , i will always use their products from now on
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Reviewed in the United States on January 29, 2026 Reviewed in the United States on January 29, 2026 by Nikoloz
BORLA PRO XS review: I initially put two Carven R mufflers on my custom 1981 corvette. It was crazy loud! It was so loud that it was hard for me to gauge how fast I was accelerating when on the gas hard. Even just cruising through my neighborhood, it sounds like I’m flooring it! Too loud. So after several online searches and reading others review I decided to try the Borla Pro XS. I bought two ( dual). Omg here’s the biggest difference. It’s a tad bit quieter but because it has such a DEEP DEEP grizzly bear tone it takes away all the crackling sound from my camshaft which makes the overall muffler sound very nice, tolerable, and more pleasant to drive, and gauge my acceleration when hard on the gas pedal. It’s perfect for being very aggressive without upsetting your neighbors. And by the way my neighbors is a cop! I recommend this muffler to anyone who’s a true restomod enthusiast that still appreciates that muscle car sound but is also respectful of your neighbors too.
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Reviewed in the United States on June 13, 2024 by Honest current review
This Borla muffler outshines my old Flowmaster on my 95 Chevy K1500 Silverado 350 engine. It is quieter than the flowmaster, however I think in time it will open up a little. In my first city/highway drive it actually seems to run smoother than before and maybe with crossed fingers a tad better mileage and power. Time will only tell! The sound is really nice and not annoying. This is our third Borla purchase as our first two are on our 73 C10 350 that has headers with 3” out to the dual Borlas and surprisingly it is much quieter than we thought. Sounds truly awesome. If you want more noise pick a different version but this style is great. They look so nice and our hopes is they last for many years to come. We have more Chevy trucks in the family that will be needing exhaust coming up and Borla will be our go to brand!
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Reviewed in the United States on September 5, 2023 by RJK
Beautiful muffler. No scratches out of the packaging. Came with a sticker. My application: 2010 Chevy Silverado 1500 lt ext cab 5.3l 6.5ft bed. Cut off the barbeque grill stock muffler right before it. Stock muffler exhaust pipe size was 3" OD before the muffler, 2.75" OD after the muffler. I put a 1ft 3" OD pipe after the muffler and a 3" down turn all before the rear axle. Beautiful set up imo. Stock muffler sounded like a car, with the proxs it sounds like a nice truck. I fell in love with the growl it makes at lower rpm like cruising at 20-25mph and you slightly hit the accelerator it sounds like a big mean dog growling. Now when you hit it off the line, it's pretty loud. It will get some looks, but it's definitely not obnoxious. Just sounds like a badass truck. The cold start is a bit loud. My friend that was in the army said it sounds like a helicopter with the low bassy womp womp womp womp. It's warm idle is pretty quiet but you can still hear it with the windows down at a stop light. Absolutely no drone on the highway both windows up or down but you can still hear the exhaust. You hear it for sure when you hit it to pass but still no drone. I've put about 800 miles on it so far and it's gotten a bit louder, but not much. It's a joy. So if you are looking for a muffler that is louder than stock, but not super loud like most exhausts, this is a great choice. Borla makes low bass sounding mufflers that sound mean and for the price are the best deal you can find.
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Reviewed in the United States on July 7, 2020 by Jeffrey Hoffman
Purchased this for my 2019 RAM 1500 Pentastar V6. Alot of people said not to put a muffler on a V6, but I went ahead and did it anyways! I do love the sound, but for my taste it is a bit loud during soft acceleration. If factory noise is a 2 and straight pipes are 10, I'd rate this at a 6. I could see myself removing it down the road since I'm not 17 anymore, but I do like it. Nice mellow sound on start up, nice burble when idling, real mean at WOT. DO check the muffler itself for factory defects before you install it. After it was welded on the techs noticed it was leaking, they looked where the neck meets the body and there was a hole in the factory weld. It was too late to take it off and return it; waiting to hear back from Borla about their Quality Control and "Million Mile Warranty". 5 stars if it wasn't for the shoddy craftsmanship.
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Reviewed in the United States on December 12, 2019 Reviewed in the United States on December 12, 2019 by PNWLish
I put this muffler on a Ram 1500 limited , wanted a little more growl without being obnoxious. This is perfect , love to hear it bark when I get on it , and love the quiet when I’m just cruising. Couldn’t be happier, zero drone. Took a couple months to really mature the sound of it, but it is exactly what I wanted when I purchased it.
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Reviewed in the United States on July 11, 2025 by Daniel G.
Borla muffler was highly recommended, instant change in performance and sounds fantastic.
Reviewed in the United States on February 5, 2026 Reviewed in the United States on February 5, 2026 by TT
Great muffler for my Chevy 5.7 V8. As per the headline, absolutely no drone whatsoever throughout the entire power band. I could barely hear myself think between 40-70 mph with my prior setup (local generic muffler install.) Nice throaty tone, not too loud, and definitely not the muffled stock sound. I wouldn't hesitate to recommend this Borla to anyone given my experience!
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Reviewed in the United States on December 11, 2024 by R. Tkac