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[mr singh]

nfortunately having a dirty back end of a car can be either a mix of good design, or bad design...

Aerodynamics play a significatnt part in recent/modern car design. By directing the flow of air
over as well as under the car, and it is used to generate a 'suction' effect at the rear to draw the
car down to the road, enhancing roadholding. The downside to this is that the trubulent air then
causes dirt and muck to be depositied all over the rear of our 'pride and joy'.
Of note kis that the Brabus upper roof spoiler and lower valance spoiler actually increase that
effect even more !  I know as the back of mine got dirtier faster when I fitted the Brab roof
spoiler, and even more dirty quicker after I fitted the lower valance !
(recently the lower valance came off...accident damage...and the rear hasn't got quite so
  dirty as it used to do....but it looks odd without it, and I'm waiting on fitting it back on again.)

as quoted by crazy, if the aerodynamics are such on the forfour, then (randomly thinking today in swindon sikh temple) the rear of the car would sit lower than normal at speed would it not?

[nomad8459]

I do believe that is the case, certainly when travelling fast down a motorway, the car seems to "hunker" down and grip more, the rear at standstill does look quite high in comparison to the front.

[mr singh]

i think it looks low compaired to other cars.