im gonna get a cold air intake for my scion tC but i dont know which one to get... which one is the best? AEM, injen, or K&N?

It depends on the shielding they come with and the positioning. Can you post pictures of each kit? That would help

AEM (http://www.autoanything.com/generic_pages/product_image.aspx?p_id=2052&g_id=755)

injen (http://www.coldairintakeshop.com/performance/buy.php?makeid=30&year=2006&modelid=670&partid=15&brandid=2821)

k&n (http://www.coldairintakeshop.com/performance/buy.php?makeid=30&year=2006&modelid=670&partid=15&brandid=2821)

one of your links is wrong. "K&N" links to the Injen intake.

anyway, from looking at the other two, i'd just buy whatever's cheaper. the most important part is the filter, so make sure it comes with a high-quality one (ie: K&N).

you can get all this kind of stuff through scion if you want

hello mate :) increasing air flow to your engine, on the other hand, will make a serious difference in the performance of your Isuzu. with a genuine cold air intake (http://www.coldairintakedirect.com/coldairintake_guide.php), you can enhance mid-range power, torque and fuel efficiency all around.

hello mate :) increasing air flow to your engine, on the other hand, will make a serious difference in the performance of your Isuzu. with a genuine isuzu cold air intake (http://]http://www.coldairintakedirect.com/makes/isuzu.html), you can enhance mid-range power, torque and fuel efficiency all around.
wtf??? who are you talking to??? nobody here owns an Isuzu except you.