I have the Darkside EGR delete. Its a nice piece of kit. What you will find though is you will be left with the pipe that comes off the cooler round to the front. I had mine removed when I had the DPF gutted and the bloke who did it said it was a pig to do. Ended up cutting it in 2, half out the front, half out the back.
Once the EGR is removed you can remove the cooler aswell. I didn't do this as when I spoke to Ryan at Darkside he wasn't sure if it was the same set up as the 140. I assume it is but didn't want to take the risk until I knew for sure.
Whoever does your remap for you will have to map out the egr too as it is physically disconnected. If I scan mine with VCDS, it shows a fault for the EGR, but this isn't flagged on the dash as an engine management light. Check my members ride link in my Sig for pics and info for when I fitted my delete pipe.