thanks gozarck
this method works pretty nice !!! feel free to uploads any settings you have discovered that may improve this ...
PS1: but sorry to disappoint you :P to trick 7z to stdin and stdout xz is the only option i tried for many weeks to make it 7z stdin and stdout and i always got an error in decomp. couldnt make it work at all .. so xz=lzma2 best option available :P plus it supports precomp+msc+srep64 all in one go :P