A scrubber is a canister that you hook up in between the valve cover and the intake. It has in it two brass or stainless steel mesh inserts that the gas is passed over before returning to the intake. The mesh scrubs the oil out of the hot gas and eliminates the blowby. At the bottom of the canister is a drain valve that you open at every oil change.
To defeat the EGR, you need to solder in a cople of diodes to the MAF sensor as it gets a signal from the EGR when open. Then, a small vacuum switch is run at the EGR activation port and thus, no more EGR. This ensures that you don't get a check engine light.