The E63 is already faster. Look at the trap speeds. The drag radials would make it quicker. and I am not talking a Hoosier or Mickey DR. I am talking Nitto 555 R.
They make them in the exact size for the E. and they handle great.

I could easily buy a sports cars. but that is not me. I like the wolf in sheep's clothing type of cars. The family sedan and the soccer mom SUV.LOL
That is why I bought the E and that is why I bought the X5 M

I was thinking of dumping the E when I got the X5. But I think I might keep it??
The only cars I would replace it with are the yet to be released M5 with twin turbos. or the 2012 E63 with twin turbos

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2011 BMW X5 M
2009 Mercedes E63 AMG-FOR SALE or TRADE