Quick question

Took my gxp for about 150 mile drive yesterday. It seems while driving on the highway if I hit a bump or pothole the back end will kind of kick. It just seems strange that it would be normal for a car like this to do this. Its never an issue where I actually need to countersteer but kinda makes your heart jump if your not paying attention and hit a pothole. I noticed it the most when I would be changing lanes. Is this normal or should I take it in and get it checked out? I've only had the car for two days and already somewhat suspicious.

Cant say that that ever happen to me. You may want to get that checked out to be on the safe side

Broken sway bars or something?

Yeah it sounds like a sway bar. Or the links are shot/broke.

Checked on the sway bar seems fine but let me stress I'm no mechanic. Could it be possible that it may be the way the tire tread is catching bumps? When I bought the car it had Eagle F1 All Seasons.

Doubt it...bad tires might cause swaying but I would only think in UN-dry conditions...if your car is coming out from under you when it hits a pot hole or a similar obstacle in the road...I'd be looking into suspension components.