Consider I bought a previously unopened RB30 bottom end. All stock. Then I got a near new RB26 head, still with stickers on the heads lower surface and had been in plastic for a while with almost no carbon in the combustion chamber. Built with H beam rods and 9:1 comp pistons, without receiving the boost it makes on the twins (basically kept atmo for run in) it makes 160rwkw.
What do stock 25's make? Wait till this baby gets 18psi.......
Lag? I don't think so!
As with any question you might ask without giving enough detail. It depends. Put a V8 Mack truck turbo on and yes it will lag, but the right turbos for the application then it will be lethal.