droop mod implies the car gets more droop.
On the rear this is done by drilling two little aditional holes in the rear shock tower.
However it might not be possible to see the additional or original holes when the shocks are mounted as these new holes are only 1 or 2 mm next (to the inside) to the original ones and are covered by the shock-mount-bushing-thingy's.
+ extra droop: rear rocker Arms mounted in reversed positioned.
On the front:
the front shocks: have a 3mm spacer inside and 2,5 mm cut off of the ball joint. (see KevLee's standard setup,
link on the-pred.co.uk)