SKU: 77189303718

Borla 40703 - XR-1 Multicore Collector Muffler Standard

Sale price$324.90 Regular price$361.00
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Description

Borla 40703 - XR-1 Multicore Collector Muffler StandardThis is the HOT set up in drag racing. This patented, award and race winning vacuum Wave Collector was designed to replace your current open header collector and serves as a power producing merge collector and muffler all in a single unit. The technology in this unit results in pulling air through the engine faster, which creates more power. When an exhaust valve opens, an energy wave is created from the expanding combustion gases. When this wave

This is the HOT set up in drag racing. This patented, award and race-winning vacuum Wave Collector was designed to replace your current open header collector and serves as a power producing merge collector and muffler -- all in a single unit. The technology in this unit results in pulling air through the engine faster, which creates more power. When an exhaust valve opens, an energy wave is created from the expanding combustion gases. When this wave encounters a lower pressure area such as a larger collector pipe or the atmosphere, a reversion wave is reflected back toward the exhaust valve. Borla's Vacuum Wave Collector Muffler ensures this wave's "anti-node" reaches the exhaust valve at the precise time for its lower pressure to help fill the combustion chamber with a fresh charge and to further extract spent gases from the chamber via a vacuum effect. Made with a patented, award and race winning multicore high flow design just like the standard XR-1(r) muffler for maximum power. This muffler is recommended for Dragsters, Altereds, and Roadsters. Accepted in NHRA, IHRA, Hot Rod Series, Brackets, Super Chevy, and NSCA. Recommend for high horsepower applications. T-304 Stainless steel will never rust. 100% welded construction for strength. T-304 stainless steel wool for sound control. Best of all, it's made in the USA. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.


Specifications:

Description_MKT This is the HOT set up in drag racing. This patented, award and race-winning vacuum Wave Collector was designed to replace your current open header collector and serves as a power producing merge collector and muffler -- all in a single unit. The technology in this unit results in pulling air through the engine faster, which creates more power. When an exhaust valve opens, an energy wave is created from the expanding combustion gases. When this wave encounters a lower pressure area such as a larger collector pipe or the atmosphere, a reversion wave is reflected back toward the exhaust valve. Borla's Vacuum Wave Collector Muffler ensures this wave's "anti-node" reaches the exhaust valve at the precise time for its lower pressure to help fill the combustion chamber with a fresh charge and to further extract spent gases from the chamber via a vacuum effect. Made with a patented, award and race winning multicore high flow design just like the standard XR-1(r) muffler for maximum power. This muffler is recommended for Dragsters, Altereds, and Roadsters. Accepted in NHRA, IHRA, Hot Rod Series, Brackets, Super Chevy, and NSCA. Recommend for high horsepower applications. T-304 Stainless steel will never rust. 100% welded construction for strength. T-304 stainless steel wool for sound control. Best of all, it's made in the USA. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.
Description_SHO XR-1 Collector
Description_ASM XR-1(r) Multicore Collector Racing Muffler - (4) 2.375" Inlets (1) 4.5" Outlet 6.75" Round x 18" Long Body 20" Overall Length. Universal Part.
Description_DEF Exhaust Muffler
Description_DES XR-1 Multicore Collector Muffler Standard
Description_EXT XR-1 Multi-Core Collector Racing Muffler - 2.375" Inlets (4)/ 4.5" Outlet 6.75" Round x 18" Long Body 20" Overall Length. Universal Part.
Description_INV Borla(r) XR-1 Collector Muffler


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Exchange/Return Notes
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SKU: 77189303718

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4.7 ★★★★★
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Verified Purchase
James B. Ross
Lexington, US
★★★★★ 5
x
Color: Nude, Size: Women 9-13
as described
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 20, 2026
J
Verified Purchase
Joe
Grantham, US
★★★★★ 1
Do not buy these
Color: Nude, Size: Women 9-13
These are terrible. They are designed to walk in. The first day I tried them on I walked about 20 steps and they basically ripped right off my feet. I didn’t think much of it and just thought ok I won’t walk in them I’ll just wear them to bed. The second pair that came with the order I wore to bed that night and woke up with holes tore in them. Terrible product
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 22, 2026
K
Verified Purchase
Kevin
Boise, US
★★★★★ 5
Durable
Color: Nude, Size: Women 9-13
These are form-fitting and durable. Wearing these keeps the skin moisturizer in place so it can be effective.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 14, 2026
K
KN
Chelsea, US
★★★★★ 5
Great Results
Color: White, Size: Women 9-13, Color: White, Size: Women 9-13
The Jfrhuds Moisturizing Silicone Socks work very well. I ordered the white 2-pack in the large size 9-13, and each came packaged in an individual zipper bag.  I wear a women's size 9-9.5, and they fit me perfectly.  I can see how they have enough stretch to fit larger sizes easily and comfortably. These socks are a lot thicker and heavier than I expected.  They are rubbery with non-slip treads on the bottom.  As soon as I put them on my feet, they actually felt very moisturizing and almost wet, even though I had not put moisturizer on my feet first.  Plus my feet felt cold at first. It was different than I expected, I had never worn this type of sock before, and it was an interesting sensation. They work great, and I am sold on the benefits of these socks.  I wear them to sleep at night and dodn't walk very far in them.  They seem pretty sturdy, but I don't want to push it and will just use them for their intended purpose.  My feet weren't super dry or cracked, but the socks really helped revive them and make them super soft again.  I love them; they are great for self-care and would also make a wonderful gift. 
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Reviewed in the United States on April 20, 2026
M
Verified Purchase
Michael S. Johnson
San Leandro, US
★★★★★ 1
Not durable
Color: Nude, Size: Women 9-13
Only used two of them so far. One sock lasted nearly 3 wears. The other broke before I could finish wearing it the second time. Basically useless junk.
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Reviewed in the United States on April 2, 2026

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