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K&N

K&N Cold Air Intake System: High-Flow Air Filter, Increase Performance & Acceleration: Compatible with 1999-2005 BMW: 323Ci, 323i, 325Ci, 325i, 325Xi, 328Ci, 328i, 57-1002

  • Based on 111 reviews
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Availability: Only 10 left in stock, order soon!
Fulfilled by Amazon
Arrives Sunday, Aug 9
Order within 3 hours and 40 minutes
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Features

  • DYNO TESTING YOU CAN TRUST: K&N air intake horsepower/torque testing is performed on wheel-based dynamometers and the reports are included with each intake system.
  • IMPROVED ENGINE SOUND - HEAR THE GROWL: K&Ns intake systems allow your engine to breathe and sound as it should- your engine will growl on acceleration and return to quiet once at speed.
  • BETTER ACCELERATION: K&N Air intake kit improves acceleration and uphill performance by improving throttle response, overall horsepower and torque. Excellent for daily and highway driving.
  • PREMIUM ENGINE PROTECTION FROM A TRUSTED BRAND: K&N air intake will not void manufacturer vehicle warranty & No-Hassle Lifetime Limited Warranty protects for the life of your vehicle.
  • HIGH-FLOW REUSABLE AIR FILTER: 4 layers of pleated, breathable cotton with K&Ns red filter oil to absorb dirt & dust particles, allowing clean air to continue flowing into your engine, only needs cleaning every 100k miles under normal highway conditions.
  • EASY TO INSTALL: Includes detailed, step-by-step instructions & all necessary parts- the entire air intake system can typically be installed in less than 60 minutes with basic hand tools.
  • MADE IN THE USA: Proudly made in the USA for trusted quality & reliability and backed by US based customer support.

Description

K&N is the inventor of the Air Intake System and has over 50 years of experience in the performance filtration industry. Proudly designed and manufactured in the USA, this premium cold air intake system is specifically designed for your vehicle and is dyno tested to provide a guaranteed increase in horsepower. It features a high flow intake tube, custom heat shield, and oversized K&N Washable High-Flow Cotton Air Filter for ultimate airflow. This Intake system replaces the restrictive OEM air box to provide an improved driving experience for daily driving or towing. It installs easily in about 60 minutes and is backed by a No-Hassle Lifetime Limited Warranty and will not void your factory warranty.Compatible Vehicles:1999-2000 BMW 323Ci1999-2000 BMW 323i2001-2005 BMW 325Ci2001-2005 BMW 325i2002-2005 BMW 325Xi2000-2000 BMW 328Ci1999-2000 BMW 328i

Product Grade: Replacement Part


Brand: K&N


Fit Type: Vehicle Specific Fit


Product Dimensions: 20.25"L x 12.2"W x 12.2"H


OEM Part Number: 57-1002


Brand Name: K&N


Model Number: 57-1002


OEM Equivalent Part Number: 57-1002


Manufacturer Part Number: 57-1002


Global Trade Identification Number: 33


Manufacturer: K&N Engineering


UPC: 024844109033


Unit Count: 1.0 Count


Included Components: Performance Air Intake System


Item Type Name: Air Intake System


Manufacturer Warranty Description: 1,000,000 Miles/10 Year


Item Weight: 3.96 Kilograms


Item Dimensions L x W x H: 20.25"L x 12.2"W x 12.2"H


Shape: Oblong


Product Grade: Replacement Part


Fit Type: Vehicle Specific Fit


Automotive Fit Type: Vehicle Specific Fit


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Aug 9

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Beware, panties may drop when you drive by!
Might have lied about the mileage part. Only because I race around town with my windows down to listen to that sweet, sweet low 3k rumble, followed by a surge of air allowing for better throttle response. When I do hit the highways I do notice a jump in mpg's, not much, but over time I'm sure its saving money. I also notice I dont have to downshift as often when accelerating. Its confident in the gear I'm in. So it's easier on your transmission for the average driver. I hooked it up to my obd2 scan tool both before I installed, and after I installed this intake and the numbers show, initially the engine temps are higher (temps at throttle body). That's to be expected in standstill traffic or at idle. But once you get moving g. The air temps drop down considerably. And when you're flooring it, watch out. I've seen temps go from 115° to 82° in a matter of moments after flooring it and switching gears. That is both good and concerning for those in sit and go traffic. I may suggest a performance filter instead of this intake system. This is not a concern for me, I'm rarely sitting for more than a few moments where I live. All in all, I like this system. It's easy to install with basic garage tools, and it sounds better too. I'm not entirely convinced the mileage for me will ever improve (leadfootitis). But it's clear that something is to be said about the air flow under load reducing the air temps. And any car guy knows, lower air temp, higher compression, more power. Spend the money and find out for yourself. ... show more
Reviewed in the United States on September 17, 2019 by Jeffery Earnest
    • Missing parts and not satisfied with quality of care for product
Missing parts... Seemed like the box was taped over the original packaging. Major parts missing. I do not have the screw on air vent qdapter. IT is missing. A lot of parts are not included. Here are the labeled parted from K&N that are missing from my purchase. Part A Part C And Part M which is a big piece to be missing. I need help. ... show more
Reviewed in the United States on April 17, 2026 by Vishal
    • Great upgrade
Really easy to install, comes with detailed instructions, adds nice little intake whistle between 2k-3k RPM and a little bit of a growl, not really gonna help with fuel efficiency, more air equals more fuel being needed to level out ratios, intake elbow is made out of plastic which I would rather have be made of aluminum but some heat wrap helps with that, otherwise a great kit and upgrade for 323ci ... show more
Reviewed in the United States on September 14, 2024 by Luis Morales
    • Good Product but BUYER BEWARE THIS WILL AFFECT MAF
Overall very happy with it. Car sounded and felt a bit different (good different) and installation wasn't too, too bad. The only thing is that this WILL mess with your MAF sensor. I read some report done by K&N that said that the oils on their products won't mess with MAFs, but my MAF functioned perfectly fine for 16 years and over the course of having it on my car for 1 year, I've had to clean my MAF twice. All you have to do is spray your MAF sensor with MAF cleaner (like $5 or something like that) and you're good to go for 6-ish months. So when you buy this, I would highly recommend that you buy a can of that stuff too. ... show more
Reviewed in the United States on August 14, 2017 by Amazon Customer
    • Very nice! On a 2002 325i
I purchased this back in June, and wanted to wait awhile to actually review it. It's been 6 months with it in and I'm happy with it! It produces a nice, throaty growl when you push it past 3000rpm. No annoying whiny noise you hear on tacky cheap cai systems on the market. Gas mileage I can't honestly say has changed. I went from about 17.9 mpg to 18.1 in the time I've had it on, but I also drive it pretty aggressively and in really bad la traffic. The car definitely has better acceleration however, noticeably different from before it was on. Installation was relatively easy if you've done any work under the hood on the e46 before, you can always YouTube it ;) ... show more
Reviewed in the United States on November 5, 2016 by Dao82
    • doesn’t fit without reworking the parts
bought this intake and tried installing it today to realize multiple parts of the intake don’t even fit into each other and don’t fit on to some of the oem parts. the actual intake doesn’t fit through the heat shield so you’d have to cut a hole bigger to make it work and the plastic replacement hose they send you doesn’t fit onto the maf sensor properly if this intake was cheaper then i wouldn’t really care but if you’re spending over 400 for an intake i would expect the parts to actually fit… ... show more
Reviewed in the United States on October 2, 2022 by Gabriel
    • 2003 BMW 325i
2003 BMW 325i Installation: Very simple, make sure you have some sockets for European cars for an easier install. Lots of videos on Youtube on how to install these filters. Also, recommend buying some mass air flow sensor cleaner and using it during the install. Performance: The air intake gives off a very nice sound when accelerating. There is a whining sound at lower speeds, but after around 30mph it is not noticeable. I have not been able to determine if I am getting better MPG. About 2 weeks after I installed this product, I received a service engine soon warning and found a P0174 code. I did some research online and found out that most people solved this problem by buying the MAF sensor cleaner and cleaning up the mass air flow sensor. I did the same, and the code is now gone. I doubt that the code was a result of this product, but still recommend the cleaner as you will be removing it during installation anyways. ... show more
Reviewed in the United States on August 17, 2015 by Joanna
    • Not enough parts
I have a 2002 325ci and the package didn’t have the parts I needed because the intake pipe doesn’t directly hook up to the original intake pipe so I had to run to the store and get a intake coupler and I had to cut the one that came with the kit in half and use it on the maf sensor and the intake filter so it’s a little janky ... show more
Reviewed in the United States on July 28, 2023 by Silent

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