How deep are your pockets? Anything is possible with a ton of cash and never ending depth's into the darkness of your blue jeans. Point being its not worth the cash you would have to fork out. If you want AWD buy a DSM or a Subi and leave the nissan's alone. Also the rb26dett swap isnt cheap infact its a pretty penny its in self. With the money you would spend doing that swap you would have one sick and fun to drive vg30dett.