Well, there are a few GTi for sales out there.
http://www.mudah.my/Proton+Satria+GTI-11611209.htm
http://www.mudah.my/Proton+Satria+GTI+1+8+Manual-10830162.htm
What do you need to do a bolt on turbo for a NA engine (Specifically EJ-DE, Kelisa engine...)? Say... boosting at a low pressure of 0.3bar only... Can list out everything?