Borla XR-1 Low Profile Multicore 2.5IN Outlet/Inlet / 4IN x 16IN / 21IN OAL Round Muffler

Marsoni

M251S

$133.00

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

Borla XR-1 Low Profile Multicore 2.5IN Outlet/Inlet / 4IN x 16IN / 21IN OAL Round MufflerSKU: 401382 UPC: 808422013826 Borla 401382 XR 1 Low Profile Multicore 2. 5IN Inlet Outlet 4IN x 16IN 21IN OAL Round Muffler This Borla XR 1 multicore racing muffler fits universal custom exhaust applications on classic cars, late model vehicles, and low clearance setups. The 2. 5 inch center inlet and outlet with reversible design deliver aggressive Borla sound while adding power, torque, and fuel economy. Compact 4 inch diameter by 16 inch body

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Definitely better than the old plugs that probably had 80k miles on them. The one star off is because I had a misfire after installing. Not sure if I damaged the plug or what, but a reinstall didn't fix the misfire. In my genius, I rushed to try to gap it and ended up breaking the iridium tip. Put the old plug into cylinder 3 (where the misfire was) and it was fine. Gonna have to get a new single tomorrow at my local shop, but a bit frustrating to get a misfire after install.

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Reviewed in the United States on April 27, 2026

Verified Purchase

Britincali

Cuba, US

★★★★★ 5

Upgrade from OEM

After seeing a quite ludicrous $403 quote to change 4 spark plugs in a Mazda3 I decided to show my son how easy it is. These were an upgrade from OEM parts. They were gapped perfectly for the car. They took 20mins to fit and work fine.

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Reviewed in the United States on February 11, 2026