A ball ache but now I've done it it would be a lot easier next time. It comes out from under the car through the centre tunnel.
Undo 3 sensors on top of the dpf. Unbolt from the turbo.
Underneath you have a bracket at the bottom of the dpf unbolt and remove bracket.
Undo the front from rear section. There is a bracket holding the downpipe to the sub frame unbolt that and then the bracket comes off with a bit of a push. Then slide the dpf down and tilt to the right. It'll slide out, a bit tight but comes.
I dropped the drive shaft down for a bit more space but don't think I needed to looking back.