I've had no problems with my car. Well, let me take that back. I put some mods on my car that caused some problems. But, the "stock" part of the car runs just fine.
The engine problem has been uncovered as a lack of oil in the pan at high RPMS, 5000 or greater. The transmission issue is due to a couple of small gears. That, when stressed(one wheel burn outs), do not handle it well.
So, what can you take away from what I said above?
Keep the oil filled half a quater over fill line. That should cover you if your going to race around and if you really like doing burn outs get an LSD.
It's a ton of fun to drive!