Hey guys/gals. I am the proud owner of a Cadillac CTS4 (its the AWD version with the DI V6 engine)

The car gets 304 HP but just always seemed sluggish. I LOVE the interior and the features, such as being able to pause and rewind live radio, the adaptive headlights, heated washer fluid, keyless access and so on...

I was looking into trading my 08 in for a 10/11 Audi S5. I LOVE the exterior of this car. More than the Caddy. The interior is OK. But mostly I am interested in performance / acceleration. I need to get back into a V8!

Anyone have experience with both?

Also when shopping for an S5 what should I look out for? Any known problems? Any advice? Thanks!