I have the same exhaust, and to get rid of the CEL, I'm running the Akraprovic Delete-R. Works perfectly and you can pick one up used on the forum for around $300. They pop up every now and then.
It's just a little thing that plugs into the OBD port, completely out of site and out of mind.
Oh and yea that's a REALLY good deal for an exhaust that makes amazing gains.