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I love the smile! At least one vendor sells them with a jig to cut out your bumper, but the idea of doing that scares the heck out of me. I know that there are possible airflow issues, unless you also have a third radiator and special ducting, a la GT3. I'm also very interested I seeing any responses to your post. I'm a sucker for a nice smile.
I think this is what you are lookin for. This is the Rennline Gt3 smile kit I installed on my car. It does require removal of the front bumper and cutting a hole but is not difficult when using their template. It just take a lot of careful measuring.