Research I found used with warranty turbo set for $1500 for N63. The biggest scare with them are the injectors. They need to be paired so if one fails you need to replace them all. About $2000 parts. Need a special tool to change them.

My N55 the injectors are a lots less expensive and 6 vs. 8.

We were cautious enough to not buy n63 with > 80,000 miles but 9 months later bought N55 model with 145,000

N63 before about 2013-4 will be the mark 1 version without Valvetronic which should make it easier to repair but they had factory problems where BMW did a soft recall they called a customer care package so try to determine if that was done.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)