Nitrous Express 4AN Pure-Flo N2O Filter & 7 Stainless Hose (Lifetime Cleanable)

Nitrous Express 4AN Pure-Flo N2O Filter & 7 Stainless Hose (Lifetime Cleanable)

Marsoni

M251S

$84.80

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

Nitrous Express 4AN Pure-Flo N2O Filter & 7 Stainless Hose (Lifetime Cleanable)The Pure Flo N2O Filter features a stone element filter that can be reused season after season. The Pure Flow N2O Filter housing is crafted of Aluminum with both 4AN size inlet and outlet fittings. The patented Pure Flow N2O Filter also features the same internal diameter of a 4AN line ensuring maximum flow and reliability. 7 in. 4AN Stainless Steel hose is included. Certificate of Origin Warranty

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Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
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This filter fits perfectly and easily. Unlike the dealer-installed filter (which I assume was an OEM filter but maybe not), it has arrows that indicate which side and orientation should be facing outward. The dealer-installed one does not have this and, as you can see from the photo, it was installed incorrectly. It should not be folded in on the sides. The old filter in the photo is after about 20K miles if that is a useful reference for you. Also, if you watch any YouTube videos, you will see a reference to releasing a plunger as the first step in releasing the glovebox door. For my 2018 Honda Accord Touring, there was no plunger, and that was confusing to me. If you don't see one, just go to the next step -- squeezing in the top, back corners of the glove box to fold it down. After that, everything goes like in the videos. Getting back to this filter -- it seems like it's better quality than the dealer-installed one. Shipping was fast. I would buy it again but, because this only takes a couple of minutes, next time I would do both the cabin and engine air filter at the same time so you might save a little money buying the combo set. Again, a very easy install and you don't risk having a dealer doing it incorrectly.

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Reviewed in the United States on September 13, 2025

Verified Purchase

Aurajeanne

Lake Worth, US

★★★★★ 5

Perfect fit

This fit perfectly into my cabin air filter slot. Save me a lot of money, getting it off here as the mechanics went to charge so much more money just to slip this filter into your car. Anyone can do it so don’t hesitate to do your own cabin filter exchange and save yourself big bucks.

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Reviewed in the United States on January 1, 2026

Verified Purchase

Not bad. But as it is with Chinese carburetors the cold start.

Phoenix, US

★★★★★ 4

Nice product

It’s good

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Reviewed in the United States on May 19, 2026

Verified Purchase

Shouka