I am in the process of making it. I will have some pics up by the end of the week of the proto type.
You WILL get a CEL only if you use the Race Pipe portion and remove the high flow cat. With the highflow cat you should be more than fine. My cat flows some serious volume so I dont think you would really need to swap it out with the included race pipe. It will make it sound louder though.
Oh, Happy boostin!
Hector