well a CAI basically takes gotts mod to the next level by opening it up all the way rather than simply going from a 2" opening to a 3" opening. but gotts mod still has some downfalls compared to a CAI, such as still having to use the stock components, mainly the crimped peice of tube that slows the air down.

although if u go over to v6f150.com they have some cool ways of improving it, mostly done by a guy named CHADD.

links to some stuff u can do to improve your intake over stock and general maintenance
http://www.v6f150.com/forums/showthread.php?t=14125

http://www.v6f150.com/forums/showthread.php?t=7909
the intake im going to try and make this summer, he did it with like $30 or something rediculous
http://www.v6f150.com/forums/photoplog/index.php?n=170

 

cool