I'll get pics of the system under the car but basically its 3.5inch all the way (with a box) and then splits out to the quads, the noise is much the same as before, (however under load it sounds amazing). I can remove the DPF and get it coded out but I dont think i'll do that.
I had to buy the trims that you require if you want to fit the BMW square tips,hence the delay.
Anyway here are the pics:-
staggered pipes

now the reason the pipes point up wards is so that they follow the line of the rear bumper...having them stright just looked crap!

rear end

another view

The system is all polished from underneath so i'll get it in the air for better pics.
The car seems to pull more but that may just be me lol!