I've been reading on this and Im a little unclear. I also went to their website too. When did this air horn came out? I bought my cold air like 4 months ago, and the filter looked regular. What did they really mean when they say air horn....I mean whats the different? Do I have that air horn, or did it just recently came out? thanks

 

AEM's had air horns when they first came out. They are no longer made. Probably because the difference they made didn't justify the cost or effort to manufacture them.