I have an 04 FXT and have been slowly building it. Bought it stock, and it now has a invidia 3" catless exhaust and Cobb intake. But now im about to install a Invidia catless up-pipe and catted downpipe. So my question is with these mods all installed would I need to get the car tuned to ensure everything will work properly? I know it would obviously be a good idea and would be better if I did, but will it harm anything if I wait a bit before I get around to getting it tuned?