IMO that video could have been done much better, I don't believe any of it.http://m.youtube.com/watch?v=PAIxeQUSg-Q
here it is. Maybe spend money on a exhaust system if you don't already have one. But I would say cold air intake or anything that can get you the coolest air possible. A sri is good and simple but you will be sucking in hot air unless you build a shield of some sorts. Its up to you in the end boss good luck.
http://www.mazdas247.com/forum/showthread.php?123759220-How-To-Ebay-FMICI like that idea hornsfan10609 ...
Best option is buy an ebay FMIC kit and make an intake with an extra pipe and a cone filter. Save $200 on buying an intake.