I only go to Audizine, and the S4 section is very active with some knowlegdable people and a reasonable ratio of BS to decent data.

I haven't owned an Allroad, but I did consider them at one time before deciding on the S4.

I think all things considered, you will be very happy with the V8 X5.

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2003 4.6is - SOLD
2003 M5 Imola
2008 Mini Cooper S
2011 Mazda CX9