Pay in installments of $36.25 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Aug 9 - Aug 14
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
Borla 400372 - XR-1 Multicore MufflerDesigned for rotary engine equipped vehicles, but can be used on other applications. Compact design is perfect for applications with limited space. 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 continuous filament fiber (CRF) accoustic material for sound control. There
Designed for rotary engine equipped vehicles, but can be used on other applications. Compact design is perfect for applications with limited space. 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 continuous-filament fiber (CRF) accoustic material 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 - 3" Center Inlet/ 3" Center Outlet 4.25" x 7.88" Oval x 12" Long Body 17" 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 - 3" Center Inlet/ 3" Center Outlet 4.25" x 7.88" Oval x 12" Long Body 17" 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. Compact design is perfect for applications with limited space. 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 continuous-filament fiber (CRF) accoustic material 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
4.9 ★★★★★
Based on 23 reviews
Sort
Product Reviews
★★★★★ 5
Great fabric & plaids! Quality construction.
Fit Type: Slim Fit, Color: Light Blue/White, Plaid, Size: X-Small, Fit Type: Slim Fit, Color: Light Blue/White, Plaid, Size: X-Small
"Light Blue White Medium Plaid" has an overall pale aqua coloring, well represented by the product photos. it's even prettier in person, with a pale purple/pink stripe and other subtle touches.
5 STARS FOR:
- Fabulous 100% Cotton fabric gets better with every wash.
- Thin (but sturdy) fabric, comfortable working outside in hot, humid SW Florida.
- OFFERING XS SLIM-FIT: Finding this XS in a slim fit Men's shirt was a game changer for me, a slim 5'7" woman with long arms, broad shoulders and slim hips. The AE Women's version of this shirt is boxy with laughably short sleeves, and is not offered in slim fit!
- Quality construction throughout. Good attention to detail, eg, matching patterns at the pocket and front placket.
- FABULOUS PLAIDS, many are unique and subtly complex.
- ATTRACTIVE COLOR OPTIONS, lots of different Blues. I've also enjoyed the paler (some might consider more feminine) colors like lavender, pink and pale aqua.
- UNBEATABLE PRICING, ESP ON SALE. At full price, these would be a good purchase. I put my favorites into the shopping cart, and wait to be notified of sale prices. I've purchased five shirts for under $10 each, by watching for sales.
PAID: $7.67 on 1/24/2026 for XS in
"Light Blue White Medium Plaid".
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 29, 2026
★★★★★ 5
Comfortable and well made.
A well-made, cotton shirt, suitable for casual wear. I like to wear this in the summer untucked with the sleeves rolled up over a colored t-shirt. I found the tail of the shirt to be a bit too long to wear untucked without looking odd, so I had it shortened; now it fits perfectly. It is made of cotton, so an iron is mandatory if you don’t want to look like you slept in it, and it will get some wrinkles as the day progresses, but that’s cotton’s nature. I liked it so much I purchased a second one.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 16, 2026
★★★★★ 4
Nice shirt, runs a tad small.
Fit Type: Slim Fit, Color: Light Blue/Indigo, Plaid, Size: X-Large
I guess that slim-fit is not for my hubby and this is a little too fitted across his pooch belly. But he loved the blue color plaid. Fits well elsewhere. If you're not a flat-stomach, dont bother with slim-fit I guess.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 29, 2025
★★★★★ 5
worth the money
Fit Type: Slim Fit, Color: Light Blue/White, Gingham, Size: Medium
perfect fit and beautiful after 3 washes.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 1, 2026
★★★★★ 5
Great shirt, great price!
Fit Type: Slim Fit, Color: Navy, Tonal Floral Print, Size: Small
Bought the shirt at a steal of a price for my son. He loves it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 16, 2026
recommand products
Nerf Steps - Cab Length - Crew Max - Toyota Tundra 2WD/4WD (2022-2025)
149.97
6 Inch Lift Kit - Air Ride - Chevy/GMC Tahoe/Yukon 4WD (2021-2024)
1099.97
Traditional Christmas Plaid Dog Bandana – Classic Holiday Style | Briggs ‘n’ Wiggles
18.00
M1 Loaded Strut Pair - 3.5in - Toyota Land Cruiser 4WD (2024-2025)
274.98
Nerf Steps - Cab Length - Crew - 5'7" Bed - Ram 1500 (19-25)/1500 TRX (21-24)
149.97