K&N parts matching Champ Labs. AF3974 air filter

The Champ Labs. AF3974 air filter cross references with the K&N air filter parts below. K&N offers compatible air filters for many Champ Labs. air filters giving you an alternative.
ProductPart NumberProduct Image 
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Chris, McDonough, Georgia
Got my filter fast and it works great. I have it on my 09 maszdaspeed3 and it helped throttle response and woke the car up a little,. and you can even hear the turbo a little better. That being said, my stock filter was at least two years old before getting the K&N drop in. Next step, going to the dealer and letting them clean the intake for optimal performance.
Kevin, Scottish Highlands
When I bought my Mazda 5 Sport back in February 2018,I decided to do a little service myself. One of the things I decided to change was the OEM panel filter for something that allowed the engine to breath a bit better. The panel filter is much thinner than the standard one,and is really easy to fit yourself.It also gives a nice subtle growl when on full throttle higher up the rev range.The filter also comes with a little K&N sticker for your car,and a handy warning sticker to pop onto your OEM airbox,or under the bonnet,to remind your mechanic that it is a long life filter,and to not be thrown away. Due to that, I'll never need to buy another filter panel for my car again,so its already worth the money paid.
Laurent Desvigne, Miserey Salines, France
Hello! I received my K&N air filter in a reasonable time and I am anxious to install it.
33-2293 K&N 33-2293 Replacement Air Filter
List Price: $75.79
Your Price: $48.99
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Donald Grim, Texas
This filter made a dramatic difference in my performance of my MX 5 2013 hardtop convertible. Thanks.
Arjen van de Vijver, Virginia
I bought a couple of air filters for different cars I own(ed) .... these products should not really make a difference in HP etc like complete Air Intake products do, but I absolutely believe and think that my cars run better and happier than with original 'paper' filters.<br /> <br /> Thank you.
Edward Schrader, South Bend Indiana
I have used them before in my Jeep TJ. Outstanding. Abslutely the last air filter you will have to buy . Now I just traded for a different car and the first thing I did is replace the air filter with a K/N life time filter.
33-2335 K&N 33-2335 Replacement Air Filter
List Price: $76.69
Your Price: $48.99
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Clive Williams, Leics, United Kingdom
I have been using K&N filters exclusively for 35 years and would use no other - I still have the my first K&Ns, which are destined for reuse. All our vehicles get a K&N at their first service. The current purchase was for a Mazda 3 I-Stop that appears to be a limited run design. Annoyingly, it is more expensive than the standard larger K&N for this vehicle. Purchase from K&N UK direct was as cheap as anywhere else with a delivery that was swift and trouble free. The replacement and fit were perfect as usual.
Tim Sides, Coedpoeth, United Kingdom
Okay, so first I have to thank the guy who said it fits the i-Stop Mazda 3, because I wasn't sure until I read that. Secondly, the air filter I took off was filthy, had grass in and everything, so basing my experience after that. Can I tell the difference? I think I can, but that might be wishful thinking, the car does feel more responsive, and whereas it had a tendency to stall starting off in cold damp weather, now it seems to be flawless. But I have only done about 100 miles since buying the filter. Am I happy with my purchase? Yes. Would I buy from again? No doubt.
Marek Kozolka, Bratislava, Slovakia
Mazda 2.0l 111kw 2011, the best buy for the car.. Ready for new exhaust system..:)
33-2999 K&N 33-2999 Replacement Air Filter
List Price: $83.49
Your Price: $53.99