Need quick exhaust advice from other Subaru drivers and/or smart people

I just posted that I am buying an 06 STI turbo back exhaust for my 04 wrx. Earlier when I was reading up on it the internet said it would be fine to do. Now after some more reading I'm finding that the STI has a catless DP. Will I throw a code with this swap and will it cause a problem. I saw something about boost creep. Will this require a tune? Ugh I hope I didn't jump the gun. I can always say no to the sale but I need a catalytic converter that fits my budget.


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