how much hp will i gain on my setup if i add water meth
 

hello guys ,I was wondering how much hp will I gain on my setup If I add water methanol injection,just want to see if its worth it or not,will be switching to 3 port boost control along side of it ,current dyno on VD is 366whp 355wtq car is an evo 8 stock block poor 98 ron fuel no e85 in my country
mods:full bolts on, fp hta green,fic 950cc injectors bc 272 cams ,manual boost controller peaking 28 psi ,holding 24-25 tapering down to 23 by redline
Really wanted to hit 400 whp on pump alone but was shocked that it wasn't possible so I would be happy if I can hit 420-440 whp on wmi,