Bought this direct from BSR, cost as much in shipping as the part so I am about 100 in for it. I can attest it worked as expected, car breathes better and has a little more kick. The extra intake noise (whistle) was a little much for me since I use my 2011 A4 primarily as a daily driver so I switched back to stock. Just one look at this compared to the stock and you can see it will help your engine breathe. This is BSR part # 46318127. Check it out on their website but I know it fits a US 2011 A4 2.0T quattro and it probably fits 2009 and 2010 as well. It has 1000 miles on it and is as new. I would let it go for 40 + 12 shipping. Just about half of what I paid. You will like it if performance is what you are looking for.

 

I am surprised noone scooped this up. Just an update, since I put the stock filter back in, there is clearly a difference in performance. For those buying K&N's, pretty sure this one is better but of course you can do your own research. If it doesn't sell, likely will one day find it's way back into my car since I already miss it and let's face it, the turbo already creates some intake noise even with the stock filter.