Either you need to keep an eye on the section for sale items for other owners, looking to sell there used cans.
Example:
http://www.camaro5.com/forums/showthread.php?t=416317
Or contact one of the vendors on this site as they have one of the best deals going today. They sell a combo deal to for a MRT exhaust and CAI intake.
http://www.camaro5.com/forums/showth...&highlight=mrt
http://www.camaro5.com/forums/showth...&highlight=mrt
http://www.camaro5.com/forums/showth...&highlight=mrt