BORLA 40359 ProXS Universal Performance Muffler 3" Offset Inlet / 3" Center Outlet 14" Long body 19" Overall Length Un-Notche

4.5 4.5 out of 5 stars | 127 ratings

Price: 112.99

Last update: 12-16-2024


About this item

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.

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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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Top reviews from the United States

  • RJK
    5.0 out of 5 stars Quality and nice low sound!
    Reviewed in the United States on September 5, 2023
    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!
  • Steven Poston
    5.0 out of 5 stars Sounds excellent
    Reviewed in the United States on June 7, 2024
    Great sounding muffler replacement on my BMW. Has a good LOW European sports car sound (like a BMW should have).
  • Beth Browning
    5.0 out of 5 stars Rawr
    Reviewed in the United States on June 1, 2024
    Makes my truck sound great. Not too loud and has a nice deep growl. No popping crap.
  • R. Tkac
    5.0 out of 5 stars NO DRONE!
    Reviewed in the United States on December 11, 2024
    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!
  • Dave
    4.0 out of 5 stars Good muffler
    Reviewed in the United States on April 11, 2019
    I like the tone. It seems to sound better the more I drive like it's seating itself. Price was good. People I talk to say borla cost a lot. Some of their stuff does. This muffler was reasonably priced. I only needed one muffler though. Magnaflow was a little more than the borla. My old muffler was a magnaflow. It lasted around 9 or 10 years. I got my pickup in 2005 and changed the muffler in April 2019. The old muffler had holes in it for a few years before I changed it. I wanted the same sound as the magnaflow or close when it was new. It has a mellow tone which I wanted. I'm pleased.
  • J. Reece
    5.0 out of 5 stars Very Clean on a big V8
    Reviewed in the United States on September 11, 2021
    The media could not be loaded.
    Attached a photo and video of product installed on my 2021 Chevy Silverado 6.2L. The product was well packaged and came to me damage free. I would not say it's a show piece but it's not heinous either. I didn't buy it for beauty though! I got it for sound.

    This universal muffler was about one twelfth the cost of a full Borla Cat-Back exhaust for my truck and as far as I'm concerned accomplished exactly what I wanted it to do. My truck sounds a lot better than stock.

    Little to no drone in cab most of the time. Might have a little bit of drone specifically at 1,800rpm but I'm not usually cruising at that specific spot on the tachometer anyhow!
    Customer image
    J. Reece
    5.0 out of 5 stars Very Clean on a big V8
    Reviewed in the United States on September 11, 2021
    Attached a photo and video of product installed on my 2021 Chevy Silverado 6.2L. The product was well packaged and came to me damage free. I would not say it's a show piece but it's not heinous either. I didn't buy it for beauty though! I got it for sound.

    This universal muffler was about one twelfth the cost of a full Borla Cat-Back exhaust for my truck and as far as I'm concerned accomplished exactly what I wanted it to do. My truck sounds a lot better than stock.

    Little to no drone in cab most of the time. Might have a little bit of drone specifically at 1,800rpm but I'm not usually cruising at that specific spot on the tachometer anyhow!
    Images in this review
    Customer image
  • Matthew Lebs
    3.0 out of 5 stars VERY LOUD And A LOT of drone
    Reviewed in the United States on April 18, 2016
    I purchased this for my 2013 Silverado 5.3L. I previously had a 4.8l Silverado with flowmaster. I researched and researched which exhaust to get because I wanted something that had good performance, sounded good, but wasn't onoxiously loud when cruising at freeway speeds. So I bought this muffler thinking it fit everything I wanted. It has great performance, good flow, and I've noticed a little bit increase in acceleration at the lower end. It sounds great at idle, and when you rev it. My complaint is that has A LOT of drone. This muffler is louder than my flomaster super 40's were when I'm doing 80mph. It's very deep and has a lot of drone, so much that it gets annoying after a while on the freeway. Doing 65-70, it's the perfect sound, loud enough to hear, but quiet enough to not get annoying on long trips. I will say that going uphill at any speed is very loud. It's louder at low RPMs, at about 2k it's very deep and a lot of drone. I don't know how it sounds from the outside, but there's not a very distinct noise on the inside, and a very deep grumble. I have no issues with its construction, seems to be well built and light construction. I have the exhaust running out the rear and it is not dumped. I like loud cars, I just didn't expect this car to be as loud or have nearly as much drone. I wouldn't buy this if you want a quieter muffler, go with the touring or something.
  • Tate-Zee
    5.0 out of 5 stars Sounds Good
    Reviewed in the United States on October 23, 2024
    Reduces drone while still sounding good

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