Borla XR-1 Multi-Core 3in Ctr-Ctr Oval 12in x 4.25in x 7.88in Rotary Engine Equipped Racing Muffler

Borla XR-1 Multi-Core 3in Ctr-Ctr Oval 12in x 4.25in x 7.88in Rotary Engine Equipped Racing Muffler

Marsoni

M251S

$134.00

Get it in 3 business days with 1 day shipping. Friday, May 29

Borla XR-1 Multi-Core 3in Ctr-Ctr Oval 12in x 4.25in x 7.88in Rotary Engine Equipped Racing MufflerSKU: 400372 UPC: 808422003728 Borla 400372 XR 1 Multi Core 3in Center Inlet Outlet Oval Racing Muffler for Mazda RX 7 1986 2002 & RX 8 2004 2011 Rotary Engines The Borla 400372 XR 1 Multi Core muffler is a compact, high flow racing component designed for rotary engine vehicles like Mazda RX 7 and RX 8. This universal part features a reversible design with 3 inch center inlet and outlet for easy installation and maximum exhaust flow. It delivers

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We offer a 30-day return/exchange service after receiving.
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So my 2005 Durango has a 5.7 and I put on 253,000 miles on it before it blew a head gasket. Since it was summer, iI decided I'd tackle it myself. The upper end was so full of gunk, I can't believe I hadn't had serious issues. Anyway, I apparently dropped some pieces of crud down the oil channels, 'cuz after putting it all back together, I got alarms for low oil pressure. Figuring I'd try anything else before replacing the oil pump, i gave this stuff a try. WOW!!!! Not only did the oil pressure return, the engine runs SO much smoother! I had forgotten how smooth it ran when it was new. The caveat is that apparently the gunk was the only thing keeping some areas from leaking - as it lost oil at a startling rate. 1 bottle of the Liqui Oil Saver though, and within a week the oil leaks completely stopped.

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Reviewed in the United States on November 8, 2025

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Marlana Lupo

Omaha, US

★★★★★ 5

Awesome!!

Had a check engine light come on for cam shaft position. Did some research online about the specific code and found that I could be due to sludge in the engine. Added this and ran for about 30 minutes and then had the oil changed. The light never came back on and the engine is running smooth and quiet. Will definitely use again.

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Reviewed in the United States on April 5, 2026

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Discovery

Lake Worth, US

★★★★★ 5

Great product

This brand is great. The car is running great

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Reviewed in the United States on March 4, 2026

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