You shouldn't have any trouble with LT headers, they will bolt right up to the Magnaflow 16483 catback. The airaid CAI is up top and in front, out of the way of the headers/exhaust...no problems there.
Yes, I bought a set of Dynatech LT headers with cats. I found a set used with 50 miles for a great price, so I couldn't pass it up. I've been waiting to install with my intake but had them on my old Z28, they were great.