Tonyspumoni 
2010 BMW 3 Series Diesel 335d 4dr Sedan (3.0L 6cyl Turbodiesel 6A)
Wow - 335d is a silent rocket
 I have waited years for performance without guilt - the 335d might just be the perfect guilt-free car.  The motor is deceptively quiet and capable of shoving 3800 lb of car 0-60 in 6. Lacking sports pkg it doesn't corner like a go kart, but body roll never feels like a problem, there's no understeer, and no sway in the tight stuff.  Ride is supple and smooth. Feels like it is made of iron.  This is a very fast, solid car - dangerously fast in fact.  The combination of smooth ride, blazing acceleration, and virtual lack of motor noise gives you no standard point of reference - you can be doing 95 and have no idea.