Silverstar said:
....
Saying that I think it might be possible to do this much cheaper using second hand components and doing it yourself or using an independent garage. If I remember correctly there is a member Anubiszed who has either already done this or is going to be doing this soon. Maybe he can shed some light on this topic.

Oh yes, I can shed a ton of light on it :rofl:
Not only is it do'able, it is very easy (relatively speaking) if you buy the OE retrofit kit.
Retrofit kit - 66 20 2 157 297 - this includes all the wiring, the sensor brackets for the rear, clips and bits n pieces.
Module - 66209252638 - Front & rear
Sensors - 66 20 2 180 146 - 8 in total
4 x sensor brackets for the front - 51117844395
Switch unit - 61 31 9 146 642 - No Seat Heating and No Stop/Start
or
Switch unit - 61 31 9 146 645 - With Seat Heating.
Now the route I went was the unconventional one :?
I bought 2 used E9x rear PDC looms from eBay
A cheap used E9x front/rear module from eBay
8 new non-genuine sensors from eBay
2 packs of new (cheap) genuine E9x sensor brackets
And a bargain priced mint used switch unit from eBay
To this I added some extra wire and a waterproof automotive plug coupler.
Buying all new genuine is going to set you back about £400 - 500
I got my parts for only £130 all in (a lot of shopping around and a lot of waiting!)
Both bumpers have to come off and a fair few panels on the inside and in the boot, then it'll need coding to the car. I filmed all of my install when I did lt last year but haven't got around to producing the finished version as of yet, and to be fair it won't be ready for a few more months yet.
Like I say it is a do'able job if you don't mind getting in there to take things apart, but to get someone to fit it all for you isn't going to be cheap. I've done a lot of retrofit work for members but have just stopped doing it all, and even I wouldn't have taken this on for someone else due to it's lengthy aspect in completing it, I did the rear first, then came back to it at a later date and did the front and then at an even later date finished off the wiring fully into the cars loom and coded it. It can be easily done in one day though.
I've attached a photo of the parts (not my photo, someone else who has also done this just recently)...
On the far left is the module, the middle left is the retrofit kit, middle right is the sensors (only four are shown), then on the right is the official instructions and a hole punch for the bumpers, although I used a step bit for my drill which I find is perfect. So to add to this photo are 4 more sensors, 4 more brackets and the switch unit.