Just plain old carbon cleaner and a couple of lint free rags should do the trick. When you get the center tunes off between the two intake manifolds spray some carbon cleaner in each of the openings and wipe them out as best as you can as the oil tends to pool in the bottom. Also take that crossover pipe off between the intake and the AOS, the oil traps in the flex texture of the pipe. Spray it good and then blow it out with the air hose.
