K&N BMW 2-3-4 Series N20 Engine Performance Air Intake System

K&N BMW 2-3-4 Series N20 Engine Performance Air Intake System

Marsoni

M251S

$210.00

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

K&N BMW 2-3-4 Series N20 Engine Performance Air Intake SystemSKU: 57S 2001 UPC: 024844373403 K&N 57S 2001 Performance Air Intake System for 2013 2016 BMW 228i 320i 328i 428i N20 Engines The K&N 57S 2001 Performance Air Intake System fits 2013 2016 BMW 2 3 4 Series models with N20 engines including 228i 320i 328i and 428i base trims. It replaces the restrictive factory air box and filter to reduce airflow restriction smooth air delivery and provide more air for increased power throughout the RPM range. Dyno

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This stuff is flat out amazing for 2 cycle small engines, works like advertised. 4 cycle isn't as good, if your engine hasn't ran in years, you'll still have to clean the carb, but it does help some. The 2 cycle oil for one is a lubricant and inhibits varnish buildup (especially a synthetic premium brand), and usually premium oil has a fuel stabilizer in it. Plus if you don't have a float bowl, there's not enough fuel for phase separation. I also use it in my mix for my ultrasonic cleaner when cleaning carbs. Overall a very good product, but understand it's limitations in this modern age of ethanal fuel.

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Reviewed in the United States on April 12, 2026

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G123

Waukegan, US

★★★★★ 5

It works well.

Size: 8 Fl Oz (Pack of 1)

Great product that delivers on what it says it does. This won’t fix a mechanical problem or damaged component, but it will fix a stuck float, varnished tank, gummed up jet, or partially blocked emulsion tube.

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Reviewed in the United States on May 14, 2026

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R Duke, Texas

San Leandro, US

★★★★★ 5

It Works

Size: 8 Fl Oz (Pack of 2)

This stuff works. I added it to my four 5 gallon gas cans before filling them up. I’ve used 10 gallons of gas in my lawn tractor so far and can tell it likes it. I do annual maintenance before summer and check or change the spark plug so it performs the best it can. I have 508 hours on it and with this it seems like it idols smoother, which indicates it has helped in the carburetor since I haven’t had to remove it and clean it. Works great.

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Reviewed in the United States on April 30, 2026

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Dennis

Belleville, US

★★★★★ 5

Great product

Size: 4 Fl Oz (Pack of 1)

Used this stabil in my rider after first start of the season. Machine running rough and uneven. Drained old fuel and added it. Within 15 minutes at full throttle it began to run normal. No back fires and engine back to normal. There will always be a bottle of this in my garage.

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Reviewed in the United States on May 13, 2026