Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 12 - Jul 17
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Description
Borla 400374 - XR-1 Multicore MufflerDesigned for rotary engine equipped vehicles, but can be used on other applications. Reversible design for installation flexibility. Patented Multicore design for maximum power. Recommend for high horsepower applications. T 304 Stainless steel will never rust. 100% welded construction for strength. High temperature T 304 stainless steel wool packing for sound control. There is no logo embossment on this part. Best of all, it's made in the USA. Just
Designed for rotary engine equipped vehicles, but can be used on other applications. Reversible design for installation flexibility. Patented Multicore design for maximum power. Recommend for high horsepower applications. T-304 Stainless steel will never rust. 100% welded construction for strength. High temperature T-304 stainless steel wool packing for sound control. There is no logo embossment on this part. 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_ASM | XR-1? Multi-Core Racing Muffler For Rotary Engine Equipped Vehicles - 4" Center Inlet/ 4" Center Outlet 6.25" Round x 16" Long Body 21" Overall Length. Universal Part. Reversible Design. |
| Description_DEF | Exhaust Muffler |
| Description_DES | XR-1 Multicore Muffler |
| Description_EXT | XR-1? Multi-Core Racing Muffler For Rotary Engine Equipped Vehicles - 4" Center Inlet/ 4" Center Outlet 6.25" Round x 16" Long Body 21" Overall Length. Universal Part. Reversible Design. |
| Description_INV | BorlaXR-1 Multi-Core Muffler |
| Description_MKT | Designed for rotary engine equipped vehicles, but can be used on other applications. Reversible design for installation flexibility. Patented Multicore design for maximum power. Recommend for high horsepower applications. T-304 Stainless steel will never rust. 100% welded construction for strength. High temperature T-304 stainless steel wool packing for sound control. There is no logo embossment on this part. 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 Multi-Core |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 2087 reviews
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Product Reviews
★★★★★ 5
Amazing product at a reasonable price
Size: 128 Fl Oz (Pack of 1)
This stuff is incredibly versatile! I use it for anything inside the car to clean it. The best part is it doesn’t leave any sort of greasy residue at all and it wipes off extremely clean. You will not be sorry whatsoever if you purchase this. I’d recommend using a brush in areas that need a little bit more work as this suds up very nice and becomes a good cleaning solution!
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Reviewed in the United States on July 18, 2025
★★★★★ 5
High quality microfiber towels and great interior cleaner
Size: 16 Fl Oz (Pack of 1)
The towels are way better than the ones i got with the old starter kit i bought from chemical guys
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Reviewed in the United States on January 8, 2026
★★★★★ 5
The best interior product
Size: 128 Fl Oz (Pack of 1)
I am a Turo host and I buy this in bulk because it is the best interior cleaner! All purpose and works on every surface I’ve come across. It has a very light smell to it, but it’s pleasant and just smells clean.
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Reviewed in the United States on July 16, 2025
★★★★★ 5
Sturdy and secure
It took a few tries to get it positioned exactly as i wanted it but once that was done it hasn't moved. I have a Samsung s25fe phone with a case and it fits just fine. Seems secure. It does shake slightly while driving on bumpy roads but it doesn't move positions and I don't feel like my phone is going to fall. So far it's been great.
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Reviewed in the United States on May 13, 2026
★★★★★ 5
Quality cell phone mount.
The best cell phone mount I ever used. Quality is obvious after you easily install. This hasn’t moved since I placed it in my car. I like that it doesn’t block the air vent too. (You can move any angle you like). Won’t disappoint! Good buy!
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Reviewed in the United States on May 1, 2026