if you take the top off you need to make sure it seals on the intake tube if not, best and cheapes way is this:

04 05 08 Chevy Aveo All Models Base LS Lt 1 6 1 6L I4 Cold Air Intake Kit Red | eBay

insted of using the second piece of the tubing, it would put the filter about where the box is, but you would just take it out anyways, and its colder air down where they have it, its cheap and i haven't heard anything bad about these.
hope this helps, all the cone filter is going to do is make it reusable, its not going to help with mpg or anything else, how they have the sir system set up, they are practically a cold air system. all it is is for looks if you do it.