Sorry bud, but your are SOL. The integrated exhaust manifold (while a nice engineering upgrade for fuel economy and stock performance) completely smashes the option to put on headers. Funny I came across this note because I ran into the same dilemma a few months ago when I heard the news on the LFX. I was planning on getting a '12 camaro with the LFX and was really disappointed to read this. But I solved all my problems a few weeks ago when I decided to get the SS. It is completely worth the few extra grand for the years of happiness this V8 will bring you.
Here is more info. on the integrated manny:
http://www.autoblog.com/2011/05/17/h...re-horsepower/