Originally Posted by Bimmer Loyalist
I disagree. Based purely on power, the 55 is better. The 63 sounds better, is more responsive, and more linear.
thats your opinion but doesnt change the fact that most people (from his experience and mine) prefer the 55 over the 63s
then again... the 63s keep improving and improving. i think the 55s just have more modding potential but thats about it. i really cant wait til the new E63 comes out though. that thing is going to be a blast to drive i bet...