QUOTE(jonbonazza @ Sep 30 2008, 03:59 PM)
MAF = Mass Airflow Sensor. Basically, it meters the air coming in to make sure it's adequate. With the 1.8L you have 2 choices... Well.. 3 really.
1) Buy a known brand and it should come with a filter housing ( I like Cosmo Racing's intakes. They are good quality and affordable)
2) You can buy a cheap intake kit on ebay (good luck they are rarely on there) and just use the factory aircan and throw in a K&N. You may also opt to cut the top off of the aircan. Will give it a little better flow.
3) Go to an exhaust shop that is capable of mandrel bending pipe, and ask them to make you a pipe and weld on a bung for the vacuum line. As for the filter, use the same method as step 2.
Also, another little trick that will let your car breathe a little better is to "hack" the MAF. Which basically means to remove the honeycomb in it. There is a tutorial on VFAQ for this and is really simple. Takes about 3 min.
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Ahhh ok it's making sense now. So in that case with the MimoUSA that I ordered already has the filter housing/filter itself. The one I ordered came a little shorter than $70 after shipping.