Only the intake cam is different I think and yeah, it would probably gain me a bit but I'm not going to bother with it cause my long term plans involve swapping in a whole 5.0 eng. from a S class--- there really is nothing unique about the 5.0 in the 500E/E500 you know. GSXR and I have already talked about swapping S-class 5.0s in place of our 4.2s at that thread I linked earlier in this thread. But you know, I'd like to turbo one of my I-6s like you have done too! Regards, Eric