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.
I agree, if you want the brute power, the E55 is the way to go. If you want a better overall package, the e63 is the way to go.
And FYI, AMG is going to FI in their next engine. Rumors are it's the 6.2L engine with a turbo.