I am in the process preparing my A3 1.8T AUM for a Re-map, I have seen a lot of people recommend a catch can. I have been reading the sticky about it and I am a bit confused with it all. Like what parts I need and why can't you leave the pcv system in and, just attach the catch can from the pipe that leads from the crank case and rocker vent and from there? If this is not possible I am a bit worried about the bit where you blank the brake booster line off. Do the brakes still work at there full potential? Sorry I am a bit of a novice to engine modifications.