HKS Downpipe (although not widely sold in North America) hasn't given me CEL yet and it's 150 cell. They don't guarantee no CEL though but Japan is super strict with car inspections and emissions and all there parts need to get emission approved. Great sound too.
Product doesn't have to change hands to charge a cancelation fee.... Cancelation would be before you got the item. After getting the item its a return and refund. Maybe read the policy next time.