Stage 3 will take you to the start of that area, Revo quote 380, others upto 400ish
You're looking at bigger turbo kit, bigger injectors, full turbo back, better FMIC, better air intake, new clutch / flywheel
Loads of recommended parts like uprated fuel pumps and possibly rods
Then you've got to consider handling and stopping so suspension and brakes.
You're
problem is there are tonnes of options, makes and models of parts so you can't really just be told what to buy. You're best bet is to contact Revo, r tech, AMD etc and talk it through with them.
Have a look at the readers rides sections, few powerful 20vts in there