The Thumper kit if capable of making in the 500-600HP range(depending on turbo).However to make that kind of power you will need the supporting mods.
Just a small run down
Motor build
Engine Management
Injectors
Thumper turbo kit
LSD
Clutch
Axles
Fuel system
transmission gears
that is just to name a few
expect to speed in the $12,000-$15,000 range for a 500-600HP Protege.
We have a customer that is in the Marines that has our Shortblock,Thumper turbo kit,E6X,LSD,axles,650cc injectors,etc and made 410whp at 20-21 psi.