K&N parts matching Champ Labs. AF3940 air filter

The Champ Labs. AF3940 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
Steve Mccully, Norwich, United Kingdom
Good service - and a good product.
Umar Rashid, Bradford England
Brilliant filter, has really improved performance, not massively, but there’s less lag, and slightly more power. More speed out of the revs. Has a healthy grunt too. The only thing I would say is I used to fill up around £50-60 a week, I’m now filling up around £60-70 a week, so the car is now a little thirstier, but that’s expected from a 3 litre V6. Thank you K&N. Love the air filter and the gains.
Fred Gervais, La Crescenta, California
I purchased the E-1987 air filter for my 2012 Audi Q5. Installation was easy, just needed to take the plastic air box on the left side of the engine compartment apart, swap the filter out, and put the box back together. It only took about 15 minutes. The K&N filter provides a little throatier sound plus it seems to make the engine a little bit more responsive than with the OEM filter. Haven't really noticed a change in MPG, if there is any it's negligible. Given that I'll never need to change the air filter in this vehicle again, plus with the other minor improvements I mentioned, to me it's well worth the purchase price.
E-1987 K&N E-1987 Replacement Air Filter
List Price: $102.79
Your Price: $65.99