I would be leary of buying anything from andysautosport.com !! A year or so ago thier was some users having problems getting thier orders and getting a hold of someoen at andysautosport.
These sites sell the 2.4 headers, realy cheap compared to the $800 for the V6 headers. Plus
fleabay has some headers for the 4 cyl pretty cheap.
http://partsforyourcar.com
http://www.z-spec.com/catalog
Ps- if you look in the OEM/Performance parts thread you will find 100's of links for parts.
Pss- headers are model specific, cavys may not work due to component location differances.