There's a couple of places around town that have tuned Lightning's before (I'll let them tune in here if they can - I think Speed, Inc. in Schaumburg has done several, and just about every place with a Dyno and a Mustang out front has done at least one at some point). Personally, I haven't gotten a tune yet (still a "new" owner), but once I start modding, I'm planning a drive to Apten in St. Louis, who from what I've seen is the closest professional L tuner.
Good luck, and let us know if you get tuned by a place nearby.