Hi sifus, im a having a B8 N/A engine right now in my mazda astina 323. At my first thought, I was planning to get a turbo for it. but after my frens opinion, i try to do it step by step by tuning up the engine 1st by doin port polish, blue printing and etc.. he say it would give me an additional of 30HP. So just wanted to ask opinion from u guys out there?