SPRING SETTLING....

You should probably get an allignment soon, unless you don't care about the wear on your tires. Did you get aftermarket C/C plates to go with your sportlines? If not, you will probably need them before you get it alligned. The factory C/C plates do not have enough adjustment available for the amount of drop the sportlines produce.

As for your bumper question... I'm not sure, but I have heard that most (if not all) Cobra bumpers will not line-up to a GT because they have a different curvature. I may be wrong though, so keep searching.