HKS SUPER FIRE RACING M40i

Marsoni

M251S

$135.00

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

HKS SUPER FIRE RACING M40iSKU: 50003 M40I UPC: 4957266720240 HKS SUPER FIRE RACING M40i for Nissan Skyline R33 R34 RB25DET Toyota JZX100 1JZ GTE Subaru WRX HKS Super Fire Racing M40i is a high performance iridium spark plug for turbocharged JDM engines. It fits Nissan Skyline R33 R34 RB25DET, Toyota Mark II Chaser Cresta JZX100 1JZ GTE, Subaru Impreza WRX GC8 EJ20 and more. This plug provides focused spark energy for quicker combustion, sharper throttle response, and added

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I will use this in every car I own from now. Cleaned it real well did exactly what it said so and my truck runs a lot better definitely can tell the difference.. it was work the extra oil and work. The bottle I bought came with instructions in English, which made it easy for me. The quality of it is light brake cleaner, but meant for engines and it ran great very easy to use this pour in.

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Reviewed in the United States on October 19, 2025

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Beni

Chelsea, US

★★★★★ 5

Does its job.

Always a go to before oil changes. Helps remove some extra sludge/deposits. DO NOT DRIVE OR REV THE VEHICLE WHEN USNG THE PRODUCT, only idle for 10-15 min. Ive seen reviews where people drove with it potentially ruining the engine.

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Reviewed in the United States on March 26, 2026

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Adan Ichich

Omaha, US

★★★★★ 5

Calidad de limpieza al motor

Excelente producto, lo llevo usándolo un buen tiempo, en cada cambio de aceite, limpia bien por dentro del motor. Es fácil usarlo, hecharlo donde se llena el aceite del motor, y enciende el motor espere 10 minutos, y apague el motor, y vuelve a esperar 25 o 30 minutos para que se enfríe el motor, ya cumplido lo 25 o 30 minutos sacar el aceite viejo del motor. Listo, producto muy recomendable. Excelente funcionamiento, chevy silverado 2004

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Reviewed in the United States on March 15, 2026

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Kwang's Chowover

Waukegan, US

★★★★★ 5

Good

Very nice very good

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Reviewed in the United States on February 10, 2026