Gearbox for a s14

Good day I am in need of a new gearbox for mu s14 sr20det the standard box can't keep up. But just want to now if the rb25det gearbox will fit or a ka24 a need a stronger box hope some one can help thanx

Best would be a rb25 fatboy box.

Hi do it fit on to te sr20det and thanx Riekert

with a bit of modification yes lol rezlo did it on his s14