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Description
Borla 40670 - ProXS? Muffler Un-Notched NeckSingle inlet and dual outlet. 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
Single inlet and dual outlet. 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/ 2.25" Dual Outlet, 4" x 9.5" Oval, 19" Long Body, 25" Overall Length. Universal Part. Reversible Design. |
| Description_DEF | Exhaust Muffler |
| Description_DES | ProXS? Muffler - Un-Notched Neck |
| Description_EXT | ProXS? Muffler 3" Center Inlet/ 2.25" Dual Outlet, 4" x 9.5" Oval, 19" Long Body, 25" Overall Length. Universal Part. Reversible Design. |
| Description_INV | BorlaProXS Muffler |
| Description_MKT | Single inlet and dual outlet. 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
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.4 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 5
variety of texture and focal points, lab approved
Flavor Name: Bacon, Size: X-Large
My labs dont try to destroy stuff. They just like to gnaw on something once in awhile. This has lasted a very long time. Has the typical dents and other gnaw marks, but has otherwise withstood the test of time. The different texture (very firm but with mild "give") and spots to focus on has made this a favorite go-to toy when the need to gnaw comes about. We often do bully sticks and yak chews for the majority of their chewing needs, but the nylon style also seems to hit the spot.
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Reviewed in the United States on March 8, 2021
★★★★★ 3
I find it sharp edges after just a little bit of chewing
Flavor Name: Bacon, Size: X-Large
My two Labradors are just not interested in this product also it's very sharp after chewing it briefly I like the Unique Style Unfortunately they are not interested maybe it's just them
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Reviewed in the United States on May 17, 2026
★★★★★ 5
Wonderful Bone Loved by Dogs
Flavor Name: Bacon, Size: Medium
Dogs love all the knobs. Easy for them to hold.
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Reviewed in the United States on February 17, 2026
★★★★★ 5
Cocker Spaniel loves it!
Flavor Name: Bacon, Size: Medium
(Check out Cocker Spaniel video) Every dog deserves a toy made with heart. From the irresistible bacon flavor to the durable nylon design, each chew toy is crafted with purpose—to give your dog joy, comfort, and a safe way to chew. Make sure to replace it after they’ve worn it out!
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Reviewed in the United States on December 20, 2025
★★★★★ 5
Sturdy
Flavor Name: Bacon, Size: Medium
My French Bulldogs have really strong jaws and are aggressive chewers. These really are sturdy and last a good amount of time. I replace every couple of months and they are one of my dogs favorites and easy for them to hold onto.
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Reviewed in the United States on April 25, 2026