the best thing for you will be K&N filter. u can practicly get it at any auto parts store. it will be a cone style filter, that will hook up to your MAF sensor.
here is application search link
http://www.knfilterchargers.com/search/appsearch.aspx
it will look something like
this
but if you want to use a regular cone filter, you will need to replace your MAF with a different kind of MAF, like GM. which will cost you some $$$$
or you can use your imagination and create some kind of can, that you can fit on the MAF, can that will have a piece of pipe where you can attach the filter.
something like
this or
this
but, do some research, and you will find more answers.
hope it helps,
Denis