When I was pulling away from a stop a few days ago on some backroads I went WOT through first gear and shifted into second and got back on it, and about 500rpm later i got a little bit of wheelhop and then it turned into a HUGE vibration and banging sound from the rear end. After that, any time I was starting to hit boost or was getting into power, the vibration/shaking and banging occured again, and the car felt like it just wheel hopping really bad and wasnt accelerating anymore. Anybody have any ideas what could have happened? I looked underneath the car and I couldnt see anything visibily wrong, so I'm guessing there could be wrong with the diff? I dont really hear a thunk when I take roll off the line (which leads me to take my focus off of the diff mount). It only occurs once i get into the powerband (or if i try to launch) and it isnt just a single thunk. I played around with it today and it appears that it isnt as bad in 3rd gear, and it hasnt happened so far in 4th or 5th gear... I have an S5 T-II if that makes a difference. Any help would be much appreciated.....

 

Sounds like you broke the front diff mount.