K&N parts matching Audi 06C133842 air filter

The Audi 06C133842 air filter cross references with the K&N air filter parts below. K&N offers compatible air filters for many Audi air filters giving you an alternative.
ProductPart NumberProduct Image 
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Keith Zollman, Phoenix, Arizona
I got this for my 2006 Audi S4, and it's a perfect fit. For those that are wondering / hearing that the K&N filter doesn't fit in the stock air box on the B7 S4, it does indeed fit, but it helps if you install it in a certain way. I tried dropping it in top first and pushing the bottom edge in, but I couldn't make it fit. But when I tried the other way - inserting the bottom first and then squeezing in the top edge, it was much easier. The top edge of the box must have more flex or something. Considering how difficult it is to replace the filter, and how little room there is to work around the engine, I am thrilled that I can leave the K&N filter in there for 50k miles if I want. Well, maybe I'll check at 30k. I recently went out and purchased K&N for all my other vehicles.
Peter Mitchell, Bushey Heath, United Kingdom
I haven't had this one fitted yet. But I have K& N filters in my XK and my R32 and in my Mustang GT in America. They improve air intake, are more efficient than standard filters and of course, last forever if you follow instructions. Peter ( petrol head obviously )
Ron, Green Cove , Florida
Perfect fit. Solved my hesitation problem during acceleration.
33-2209 K&N 33-2209 Replacement Air Filter
List Price: $85.29
Your Price: $54.99
K&N Replacement Air Filter
  • Designed to Increase Power
  • Million Mile Limited Warranty
Sorin Moraru, Ajax, Canada
Great product, not a single problem. Gas mileage increased after adding this filter.
Jim Y. Campbell, Cedar Falls, Iowa
This is the 3rd air filter that I have purchased for 3 different vehicles. Each has met or exceeded my expectations.
Víctor Pereira, Sevilla, Spain
Perfect! Acceleration is much more constant, less lag in power and fuel consumption has improved.
33-2945 K&N 33-2945 Replacement Air Filter
List Price: $84.19
Your Price: $53.99