Hey everyone. I've been reading everything I could on here for a couple months while I shopped for a car. I just purchased an 08 GXP. I have always driven a truck and decided I wanted something different/fun to commute with. This car is very fun to drive. I love the V8 sound. I do have a couple quick noobie questions.
1. The ride is stiff. Now I realize the ride should be stiff, but anytime I hit a somewhat square edge it sounds horrible like the front end is bottoming. For example railroad tracks are bad or running over a man hole cover at speed. If I am just rolling through it like in a parking lot its fine. I want to think struts, but I can barely get the car to move bouncing on it so I would think they are ok. Any ideas are appreciated.
2. This also has to do with ride quality. The previous owner has 225/50/18's on all 4 corners. Could the fact that is not the proper tire of 255/45/18's be causing some of my ride problems? Is there any issue running the 225's on all 4 corners?

Like I said I am used to driving a Ford truck and not a car so I can't really diagnose whats correct and whats not at this point. I'm sure I will have a lot more questions to ask as I figure it out.