I am a bit amazed at the number of problems some people seem to be having...
I've had My E4 for a couple of months now and have run everything from 13.5BL to 5.5BL 6 cell... and the only thing thats happened is that I've stripped a belt because I got a rock caught in it... I even had the steering knuckles in upside down and it still performed well
How about a few more people posting about how WELL the car goes...