I'd guess that with the new engine line-up, they probably have a re-vamped air intake breather system. Pull yours out, and snap a pic n show us what is in the '11. I wonder if the 4 different engine options all have their own individual air box too.....

 

On my 2010 I purchased a dry flow AFE drop in filter, did the gotts mod and gutted the entire right lower portion of the airbox. No dyno before or after but it does have a deeper growl.

 

I would stay with the stock filter and just take the snorkel out. I have played with all the K+N Filters and never noticed any difference.