Hello everyone buying my AEM cold air intake and air pass valve from
www.aieonline.com. Have the intake selected but dont know what size valve I need to get, I have a 2002 Civic EX:

and the options are 2.5 inch, 3.0 inch and 2.75 inch. Here is the page with it http://www.aieonline.com/65/cat65.htm?616


Help will be greatly appreciated, want to order it this morning. Thank you in advance


also is AIEonline reliable?

The size is not length but diamater. Get the one that matches the diamater of your intake tube. Probably 2.5 but I'm not sure.