K&N parts matching Parts Plus AF3940 air filter

The Parts Plus AF3940 air filter cross references with the K&N air filter parts below. K&N offers compatible air filters for many Parts Plus air filters giving you an alternative.
ProductPart NumberProduct Image 
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
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.
Bob O'Neill, Sarasota, Florida
I have 5 different vehicles and all have K&N air filters
Celerino Lopez, New Milford, New Jersey
The installation was fairly easy, and the instructions were helpful. I still have to observe if fuel efficiency improved as time goes by. I noticed improved pick up during acceleration which was very pleasing. My only complain is that the threads on the filter bolts stripped very easy. I believe I may have stripped the threads on one of them when I tightened it, and I wasn't even applying too much pressure. I just hope it doesn't loosen to the point of disconnection.
E-1987 K&N E-1987 Replacement Air Filter
List Price: $102.79
Your Price: $65.99