Personally I would go the coilover route. If you go with just springs I'd get koni yellows to go along with it because stock x drive shocks are weak. I ordered coilovers last week because I can raise it back up in the winter so I'm not snow plowing and the handling and ride will drastically improve. Coilovers as well will let you dial in your drop more than what springs would. Anything is safe on xdrive just search the forums a little on springs and shocks combos vs coilovers and see what appeals to you more and your budget and do your homework and you'll be good
