i have a stagea engine in my r33 gts4 and it is exactly the same as a rb25det, except that the sump you will have to change because of the 4wd drivetrain in the stageas',loom you can get away with the standard one because i think the stagea loom has the fwd linked into it. im actually taking my stagea engine out and selling it if you interested, because im putting a rb25det in so ill swap the sump myself... pm me if your interested