Ok, so I asked a lot of people this question and I am not sure I got the right answers. I guess I might just be worried. I did a head swap (changed the balancer at the same time) and 2 days later, the car started vibrating like crazy after a few burn outs. It drove perfect for those 2 days before hand. It vibrates with higher rpm, no matter whether its in gear or not, moving or not, all variations. A lot of people say I threw a weight from my flywheel or I that maybe bent it when I did the burn out. At idle, it barely vibrates, but when I rev it up to over 3K it vibrates like crazy. I can drive it, but only in the 2k rpm range. I just parked it for now. I drove it like that to get home and probably went 15 miles. Do you think it's the flywheel? Did I damage something else in the engine? I replaced the clutch probably 40k miles ago. Should I not drive it at all like this?