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K&N 33-5040 Air Filter

Replacement Filters > Replacement Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.8 out of 5 stars   27 Customer Reviews
  • Designed to boost horsepower and rate of acceleration
  • Can be cleaned and used again
  • High air flow with exceptional filtration
  • Lasts up to 50,000 miles before cleaning is required depending on driving conditions
  • Works with original equipment manufacturer vehicle electronics
  • Emissions legal in all 50 US states
  • Will NOT void vehicle warranty
  • Million Mile Limited Warranty®
The K&N 33-5040 Air Filter fits some Abarth 124 Spider, Fiat 124 Spider, Mazda MX-5, Mazda MX-5 IV, Mazda MX-5 Miata, and Mazda Roadster models. See vehicle applications link for details.
K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. We make over 1,200 different replacement air filters for the majority of vehicles on the road. These filters are washable and reusable and are custom designed to fit into your existing factory air box. Their drop-in design means adding performance is simple. With most vehicles you simply remove the disposable air filter and replace it with a K&N. See applicable instruction sheet for details. Our stock replacement air filters for street vehicles are covered by our famous K&N Million-Mile Limited Warranty and will be the last air filter your vehicle will ever need.

[More Information on K&N Replacement Air Filters]

Product Specifications

Air Filter ShapePanel
Filter MaterialCotton Gauze
Height1.125 in (29 mm)
Outside Length13.563 in (344 mm)
Outside Width5.625 in (143 mm)
Package Contents1 Air Filter
Package Quantity1
Warranty1,000,000 Miles/10 Year
Product StylePanel Air Filter
Weight1.1 lb (0.5 kg)
Filter Re-Oiling Amount1.05 oz (31 ml)
Product Box Height1.75 in (44 mm)
Product Box Length13.56 in (345 mm)
Product Box Width7.72 in (196 mm)

K&N 33-5040 Air Filter Product Reviews

Tuesday, April 24, 2018 - Part 33-5040
I have not noticed any significant changes or improvements in any way.

Mike Nielsen
Estacada, Oregon
Thursday, April 12, 2018 - Part 33-5040
I recently purchased a Fiat 124 Spider Anniversary to replace my 2003 Mazda MX5 mk. 2.5 Sport to which I had fitted a K&N Typhoon Induction Kit which dramatically improved its performance and with which I was very pleased. I had already ordered a K&N 33-5040 filter for the Spider, which arrived within 48 hours of placing my order and was ready to fit when I brought my new car home. It took 5 mins. to fit and I can honestly say that it the best value, time and money I have ever spent on any car I have owned in over 50 years of driving. The increase in acceleration and performance is startling, and it sounds fantastic too. If you do one thing to improve the performance of your car, fitting a K&N filter would be my suggestion.

Kevin Armstrong
Blackpool, United Kingdom
Wednesday, February 7, 2018 - Part 33-5040
Had a K&N filter in a Harley Davidson without any issues ar all. Figured i buy one for my new 2017 Abarth Spider turbo. Read a few concerns regarding a K&N adversely affecting MAF sensors. After doing some research I felt comfortable enough to buy a filter. Couple of weeks use and pleased to reveal that no adverse issues have been experienced. Instead I am pleased to say that performance has increased. Prior to changing to a K&N filter my Roadster used to bottom out at 5000 rpm. Now it hits 6500 rpm and i think i could have pushed it to redline 7000 rpm. I put this down to enough air making it's way through to the rest of the engine. It feels a little more perky but not by much. All up I am happy in having purchased the Filter. I have only one suggestion. Please provide adequate installation details such as what side must face where and please state if it needs oiling or if it is factory pre oiled.

Rainer Lucks
Paradise, Australia