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Description
Borla 400487 - ProXS? Muffler Notched NeckSingle inlet and dual outlet. Notched necks for easy clamp on installation. Reversible design for installation flexibility. This muffler is generally used in a system that has a single inlet and dual outlets, but it can also be installed in a system with dual inlets and a single outlet. High quality T 304 austenitic stainless steel will never rust. 100% welded construction for strength. Free Flow design for improved performance. High temperature
Single inlet and dual outlet. Notched necks for easy clamp-on installation. Reversible design for installation flexibility. This muffler is generally used in a system that has a single inlet and dual outlets, but it can also be installed in a system with dual inlets and a single outlet. High quality T-304 austenitic stainless steel will never rust. 100% welded construction for strength. Free Flow design for improved performance. High-temperature continuous-filament fiber (CFF) acoustic material for sound control. Natural mill finish can be brushed or polished prior to installation. Best of all, it's made in the USA and backed by Borla's Million-Mile warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.
Specifications:
| Description_ASM | ProXS? Muffler 3" Center Inlet/ 2.5" Dual Outlet, 4" x 9.5" Oval, 19" Long Body, 24" Overall Length. Universal Part. Reversible Design. Notched Necks. |
| Description_DEF | Exhaust Muffler |
| Description_DES | ProXS? Muffler - Notched Neck |
| Description_EXT | ProXS? Muffler 3" Center Inlet/ 2.5" Dual Outlet, 4" x 9.5" Oval, 19" Long Body, 24" Overall Length. Universal Part. Reversible Design. NOTched Necks. |
| Description_INV | BorlaProXS Muffler |
| Description_MKT | Single inlet and dual outlet. Notched necks for easy clamp-on installation. Reversible design for installation flexibility. This muffler is generally used in a system that has a single inlet and dual outlets, but it can also be installed in a system with dual inlets and a single outlet. High quality T-304 austenitic stainless steel will never rust. 100% welded construction for strength. Free Flow design for improved performance. High-temperature continuous-filament fiber (CFF) acoustic material for sound control. Natural mill finish can be brushed or polished prior to installation. Best of all, it's made in the USA and backed by Borla's Million-Mile warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand. |
| Description_SHO | ProXS? Muffler |
Shipping Notes
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Exchange/Return Notes
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4.0 ★★★★★
Based on 8 reviews
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Product Reviews
★★★★★ 5
Great quality and price
Color: Black, Size: without USB
The arm needed some additional tightening, but it’s holding my 32 in monitor perfectly. Great stability and mobility. The cable organizer is a bit awkward, but works well enough. I’ll probably stick with this brand in the future; the cost vs quality is amazing.
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Reviewed in the United States on October 31, 2025
★★★★★ 5
Fantastic upgrade from my original stand. Base is a little bulky, but stand is versatile and sturdy.
Size: Single, Style: Free-Standing, Size: Single, Style: Free-Standing
Amazing value for this stand. I needed a stand with more degrees of freedom than the original one that came with my monitor, and this stand (which was inexpensive relative to the cost of the monitor) was a great purchase. The base of the stand is a little bulky/high, and the soft material on the bottom of it can rub off very easily if you let the stand catch the back edge of your desk. Otherwise though, the stand is extremely easy to install, and it provides far more degrees of freedom for rotation and translation than the original stand for my monitor. Now my monitor is sitting at a comfortable viewing angle closer to my desk tilted slightly upwards toward me.
Just keep in mind that you have to tighten down the height and tilt adjustments (the things that would be affected by gravity). So, if you want to adjust those frequently, this stand might not be a great fit for you. That said, it does provide a hidden but easy-to-access spot to store the keys needed to loosen it up to make those adjustments. So, if you need to make those adjustments, you'll always have quick access to the necessary tools.
Highly recommended for its price in particular.
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Reviewed in the United States on October 2, 2025
★★★★★ 5
A Solid Monitor Stand
Size: Single, Style: Free-Standing
This is an extremely sturdy monitor stand. Easily assembled in less than 20 minutes. Instructions were simple. The hex tools came with the stand, but you just need a Nr 2 Phillips Screwdriver for the bolts mounting the VESA plate to the monitor. Take note that this stand has a heavy base to hold larger/heavier monitors up to 22 lbs, but does not take a lot of space. I chose this variant so that it could handle my heavy 24-inch Planar monitor. The included cable management clip was a nice touch. Rotation and tilt feature moves easily and has decent range. I'm very happy with my purchase and it was available for overnight shipment in my region.
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Reviewed in the United States on December 28, 2025
★★★★★ 4
WALI Dual Monitor Stand: A Solid, Space-Saving Base Camp
Size: Dual, Style: Free-Standing
WALI Dual Monitor Stand: A Solid, Space-Saving Base Camp
I needed to reclaim some real estate on my crowded desk, and this WALI freestanding mount did the trick. It's a straightforward, no-frills solution that holds my two 24-inch monitors securely and opens up a ton of space underneath.
Assembly is intuitive, though having a second pair of hands is helpful when you're attaching the monitors to avoid any tipping. The all-metal construction feels sturdy and reliable. The adjustments are basic but effective—you can raise or lower both monitors together on the central pole and tilt or swivel them individually to get the angles just right. The included cable management clips are a nice touch for keeping things tidy.
The key thing to understand with any freestanding mount is balance. If you extend the arms all the way out toward you, the whole unit can get top-heavy and want to tip forward. I keep my monitors positioned more centered over the heavy base, and it's perfectly stable. It's not meant for dramatic, extended poses.
For the price, it's fantastic value. It doesn't have the infinite, fluid adjustability of high-end gas-spring arms, but it doesn't need to. It lifts your monitors, frees up your desk, and does its job without any fuss.
Bottom Line: An excellent, budget-friendly way to lift two monitors and dramatically increase your usable desk space. Just be mindful of the center of gravity and don't expect ultra-flexible, independent positioning.
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Reviewed in the United States on August 26, 2025
★★★★★ 5
Nice, sturdy, and supportive and easy to set up for my dual 27" monitors!
Size: Dual, Style: Free-Standing
Nice, sturdy, and supportive and easy to set up for my dual 27" monitors!
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Reviewed in the United States on May 18, 2026
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