since i have the r34 cross member the swap will be pretty straight forward and it wires in just like an rb25 non neo. if i am able to have it wired up right i should b fine because its a 2001 and all the evap shit is still on the clip. i went with the rb because of the power delivery and it has the potential to be a monster. the neo already has factory upgrades like 440cc injectors solid lifters better flowing head and rb26 connecting rods and bigger turbo that a regular rb25