K&N parts matching Champ Labs. AF3997 air filter

The Champ Labs. AF3997 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
Mike, Ohio
Only gains ive noticed are on the interstate going up long grades. Before the K&N filter, I'd constantly have to grab 4th to get up to speed (65-70) but now in 5th I have to let off the gas at 80mph or risk getting caught speeding. Not sure about fitment of the filter...the only way that it would work is to have the pleats facing the incoming air whereas the original had the flat surface towards the air and the pleats facing the throttle body. Didn't see any airflow direction marked on the filter so i ran how it fit and it seems to work ok. I like the sticker too wish i get a couple more somehow. Good product its sturdy you can feel the quality its not like the flimsy lighter than air filters you get from the parts house.
Austin Griffith, Fountain Inn, South Carolina
I have used K&N filter in my motorcycles for many years, and was anxious to try them in my pick-up truck. I was not disappointed at all. I installed the filter prior to a 1200 mile trip and was pleased to realize an increase in power and gas mileage, just as I had in my motorcycles for years and years. Thanks for making a great product...keep up the excellent work
Tom Watson, Valrico, Florida
Everything was fine. Would purchase again.
33-2324 K&N 33-2324 Replacement Air Filter
List Price: $82.69
Your Price: $52.99