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
Ricky Graham, Austin Texas
Its the last air fliter you will buy for your car. My car is breathing a lot better.
Laurent Desvigne, Miserey Salines, France
Hello! I received my K&N air filter in a reasonable time and I am anxious to install it.
SHEK, BVT
WOWOWOWOWOWO!!!!!!!!!!!!!!! what a change..<br /> I already feel the power and increase in gas mailage .....quick ..... Awesome air filter..<br /> I dont know why I didnt hear about this(K&N)product before<br /> <br /> This is not only a air filter, its a bullet.. fast, power and sound!
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
Phillip Wedel, Manitowoc, Wisconsin
I never thought that a simple one minute job would make such a difference. The acceleration on my 2006 Miata has improved noticeably. This thing is also washable so it's the last air cleaner I'll ever need. I highly recommend this product.
Jerry Adamo, Lake Forest, California
I've always been very happy with K&N filters for all my vehicles. I ordered this one with free ground shipping. It was delivered in less than 24 hour! FANTASTIC!!! Thank you,.
Philip , USA
Filter for 2010 Miata and 2015 Civic. I haven't had but one drive with the Miata, and I think there is a difference, but with the Civic with a five speed, I'm getting 40 miles per gallon on the highway, and almost that on secondary country roads. I'm still breaking the car in gradually, so I haven't had a chance to really test the performance, but so far, VERY positive results!!
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
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.
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.
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