un1 box,which one is best for acceleration??

is it the 25/gta/master/21 turbo box which will give the best accelleration for my 25 turbo??have heard its the 21 turbo box??/if so any mods needed or straight fit,but have also been told the 25 box is great,gta is more geared to top end??

The box you have has the lowest final drive (bar the Master box which is stupidly low), and thus the best acceleration, better than the GTA/21 setup.

thanks dave,at least thats a good start!!fitting exhaust tonight,plus other mods over weekend,should notice some difference(hopefully!)