2) I have not dyno'd my car specifically but I have seen gains of 15hp+ for the LTs & O/R X
3) No I have the stock ABs and at idle it sounds pretty much stock. No drone. No obnoxious noise. When I return from deployment, I'll be installing resonators and Roush ABs.
Bottom line. Get the tune. Get the LT Headers. Get the O/R X. You'll love it.
Hope you get home safe. Thanks for your service.
I guess i'll be holding off on it then, I don't want to tune it until the warranty is up...