I removed the air compressor, small air canisters, accumulator and valve block. Plus the fuses in the rear quarter panel for the compressor etc. I left just the actual air lines running throughout as that was a little more hassle to remove them.

You can however, just remove the fuses in the rear and leave everything in the X as you just want the compressor kicking in trying to feed air to the bags that have been removed.

Also by selling my air pump and other components I actually made quite a bit of money back towards the cost of the KW's etc. eBay'd everything and got something like $1400 back.

Only thing that remains is the control module itself as it is required for the other systems (4x4, DSC, etc).