Well I just found this by doing a quick search: 11) What air intake do I use?

"There is not a cold air intake pipe made for either the Spyder GS or the 7G Galant. However, both cars utilize the same Mass Airflow Sensor (MAS) as the 2G Eclipse turbo. As such, any hi-flow filter kit (such as the K&N FIPK or similar) that you can buy for the Eclipse turbo will bolt up to the 4G64 intake. While this is not completely optimum (because of sucking in higher temperature engine compartment air), it does add a good 5-10HP, and allows better airflow at higher RPM's."

http://diy.prostreetonline.com/techtips/showarticle.asp?articleid=15

That should answer your question.