What's with the "need" for a V8?
I have been driving the 6's for many years, very very few engine related problems the one V8 I had years ago was a nightmare, alternator, radiator, electrical gremlins, terrible gas mileage...etc...
So let me ask you, have you actually driven a late model 3.0?
It seems to me that unless you are pulling a BIG trailer, why the V8?
I have NAILED the 6 on an entry ramp and it really scoots....

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BMWCCA # 12660
14 GLK 350 M/B (hatefull POS gone)
05 CLK 500 AMG Cabrio
07 530xiT
09 Boxster