Almost emergency Car/Sub vibration question

[Slick]

So I just installed a sub, amp, and radio. It is a Pioneer DDin, 600 watt Kenwood, and two 300 watt RockFos 12" subs. The boxes are both about 2 cu ft. Needless to say, I don't have a rear hatch Anywho... Im not sure what db i'm reaching but its enough for me, a 21 year old, to not want to turn it up all the way becuase it hurts to much.

My question, as I was showing it off to my buddy I noticed that my windshield moves quite excessively with the bass going. Now, my subs are firing toward the back windows. Is it possible to bust my windshield out? Maybe from the roof shaking so much? IDK, I had the same setup in my single cab truck but smaller boxes and I didn't notice this problem. Course, the extra airspace has made a huge difference. IDK, idk, idk. Any advice would be helpful. Anyone heard of a yaris windshield busting out or something? Thanks