Hi,
I've got Laser KN as well and before you buy anything, try cleaning the
MAF sensor. I cleaned mine and what a difference in fuel economy and response.
You should also clean your throttle butterfly while your in there..
Also I'm not sure if this is allowed here but here's a great link to a site I found on how to do this...
http://www.mazda6tech.com/index.php?...id=62&Itemid=1
Mick