I heard rumor that If I throw a free flow cat on Ill get my check engine light. Which would annoy the snot out of me. IS this fact or just a freak incident?

To complete my ( I/H/E ) Im looking at the following mods..

DC Sports Cat back
Random Technologies Free Flow Cat
DC Sports Stainless 4-1

Then I'll start messing with Cams , V-AFC's , ect...